Michael J Ottman

Interests

Research

His research interests include the effects of fertilization and irrigation on crop yield, how climate change will affect crop production in the future, use of proximal sensing for crop management decisions, and modeling crop growth and development.

Courses

Scholarly Contributions

Chapters

• Kimball, B. A., White, J. W., Wall, G. W., & Ottman, M. J. (2016). Wheat Responses to a Wide Range of Temperatures: The Hot Serial Cereal Experiment. In Improving Modeling Tools to Assess Climate Change Effects on Crop Response. Madison, WI: American Society of Agronomy. doi:10.2134/advagricsystmodel7.2014.0014

Journals/Publications

• Carter, A. Y., Hawes, M. C., & Ottman, M. J. (2019). Drought-Tolerant Barley: I. Field Observations of Growth and Development. Agronomy, 9(5), 221. doi:https://doi.org/10.3390/agronomy9050221
• Carter, A. Y., Ottman, M. J., Curlango-Rivera, G., Huskey, D. A., D’Agostini, B. A., & Hawes, M. C. (2019). Drought-Tolerant Barley: II. Root Tip characteristics in Emerging Roots. Agronomy, 9(5), 220. doi:https://doi.org/10.3390/agronomy9050220
• Heun, J. T., Attalah, S., French, A. N., Lehner, K. R., McKay, J. K., Mullen, J. L., Ottman, M. J., & Andrade-Sanchez, P. (2019). Deployment of Lidar from a Ground Platform: Customizing a Low-Cost, Information-Rich and User-Friendly Application for Field Phenomics Research. Sensors, 19(24), 5358. doi:https://doi.org/10.3390/s19245358
• Ottman, M. J. (2019). Nondormant alfalfa varieties for Arizona, 2019. College of Agriculture and Life Sciences, University of Arizona, Tucson.
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  Annual alfalfa variety summary
• Ottman, M. J. (2019). Wheat and barley varieties for Arizona, 2019. College of Agriculture and Life Sciences, University of Arizona, Tucson..
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  Annual wheat and barley variety summary
• Hu, J., & Ottman, M. J. (2018). Stripe Rust of Small Grains. Arizona Cooperative Extension Publication.
• Kimball, B. A., White, J. W., Wall, G. W., Ottman, M. J., & Marte, P. (2018). Wheat response to a wide range of temperatures, as determined by the Hot Serial Cereal (HSC) experiment. Open Data journal for Agricultural Research, 4, 16-21. doi:doi.org/10.18174/odjar.v4i0.15829
• Marte, P., Kimball, B. A., Ottman, M. J., Wall, G. W., White, J. W., Asseng, S., & Ewert, F. (2018). The hot serial experimant for modeling wheat response to temperature: Field experiments and AgMip-Wheat multi-model simulations. Open Data Journal for Agricultural Research, 4, 28-34. doi:doi.org/10.7910/DVN/ECSFZG
• Ottman, M. J. (2018). Nondormant alfalfa varieties for Arizona, 2018. College of Agriculture and Life Sciences, University of Arizona, Tucson.
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  Annual alfalfa variety summary
• Ottman, M. J. (2018). Wheat and barley varieties for Arizona, 2018. College of Agriculture and Life Sciences, University of Arizona, Tucson..
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  Annual wheat and barley variety summary
• Ottman, M. J., & Hu, J. (2018). Stripe Rust of Small Grains. Arizona Cooperative Extension Publication, 4.
• Ottman, M. J., & Ray, D. T. (2018). Plant spacing and row width effect on productivity of sweet sorghum. Agronomy Journal, 110(3), 1008-1016. doi:10.2134/agronj2017.07.0389
• Clark, N., Orloff, S., & Ottman, M. (2017). Fertilizing high yielding alfalfa in California and Arizona. Better Crops with Plant Food, 101(4), 21-23.
• Maiorano, A., Martre, P., Asseng, S., Ewert, F., Muller, C., Rotter, R. P., Ruane, A. C., Seminov, M. A., Wallach, D., Wang, E., Alderman, P. D., Kassie, B. T., Biernath, C., Basso, B., Camarrano, D., Challinor, A. J., Doltra, J., Dumont, B., Gayler, S., , Kersebaum, K. C., et al. (2017). Crop model improvement reduces the uncertainty of the response to temperature of multi-model ensembles. Field Crops Research, 202, 5-20. doi:10.1016/j.fcr.2016.05.001
• Moya, S. C., Moya, S. C., Ottman, M. J., Ottman, M. J., McDaniels, A., McDaniels, A., Aragón, A. C., Aragón, A. C., Hongu, N., Hongu, N., Moya, S. C., Ottman, M. J., McDaniels, A., Aragón, A. C., & Hongu, N. (2017). Ancient Rediscovering Food: Grain Amaranth. College of Agriculture and Life Sciences, University of Arizona, Tucson..
• Ottman, M. J. (2017). Nondormant alfalfa varieties for Arizona, 2017. College of Agriculture and Life Sciences, University of Arizona, Tucson.
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  Annual alfalfa variety summary
• Ottman, M. J. (2017). Wheat and barley varieties for Arizona, 2017. College of Agriculture and Life Sciences, University of Arizona, Tucson..
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  Annual wheat and barley variety summary
• Ottman, M. J., & Mostafa, A. M. (2017). Getting it right - phosphorus fertilizer use in Arizona alfalfa. Western Farm Press.
• Ottman, M. J., & Mostafa, A. M. (2017). Phosphorus fertilizer for alfalfa. College of Agriculture and Life Sciences, University of Arizona, Tucson.
• Ottman, M. J., Diaz, D. E., Sheedy, M. D., & Ward, R. W. (2017). Effect of Amount of Irrigation Water Applied on Forage Sorghum Yield and Quality at Maricopa, AZ, 2015.. College of Agriculture and Life Sciences, University of Arizona.
• Ottman, M. J., Diaz, D. E., Sheedy, M. D., & Ward, R. W. (2017). Forage Sorghum Hybrid Yield and Quality at Maricopa, AZ, 2015. College of Agriculture and Life Sciences, University of Arizona.
• Ottman, M. J., Diaz, D. E., Sheedy, M. D., & Ward, R. W. (2017). Irrigation Interval Effect on Yield and Quality of Forage Sorghum at Maricopa, AZ, 2015. College of Agriculture and Life Sciences, University of Arizona.
• Ottman, M. J., Diaz, D. E., Sheedy, M. D., & Ward, R. W. (2017). Nitrogen Fertilizer Rate Effect on Forage Sorghum Yield, Quality, and Tissue Nitrogen Concentrations at Maricopa, AZ, 2015. College of Agriculture and Life Sciences, University of Arizona.
• Ottman, M. J., Diaz, D. E., Sheedy, M. D., & Ward, R. W. (2017). Row Spacing Effect on Forage Sorghum Yield and Quality at Maricopa, AZ, 2015. College of Agriculture and Life Sciences, University of Arizona.
• Wang, E., Martre, P., Zhao, Z., Ewert, F., Maiorano, A., Rotter, R. P., Kimball, B. A., Ottman, M. J., Wall, G. W., White, J. W., Reynolds, M. P., Alderman, P. D., Aggarwal, P. K., Anothai, J., Basso, B., Biernath, C., Camarrano, D., Challinor, A. J., De Sanctis, G., , Doltra, J., et al. (2017). The uncertainty of crop yield projections is reduced by improved temperature response functions. Nature Plants, 3, 1-11. doi:10.1038/nplants.2017.102
• Webber, H., Martre, P., Asseng, S., Kimball, B., White, J., Ottman, M., Wall, G. W., DeSanctis, G., Doltra, J., Grant, R., Kassie, B., Maiorano, A., Olesen, J. E., Ripoche, D., Rezaei, E. E., Semenov, M. A., Stratonovitch, P., & Ewert, F. (2017). Canopy temperature for simulation of heat stress in irrigated wheat in a semi-arid environment: A multi-model comparison. Field Crops Research, 202, 21-35. doi:http://dx.doi.org/10.1016/j.fcr.2015.10.009
• Dai, J., Bean, B., Brown, B., Bruening, W., Edwards, J., Flowers, M., Karow, R., Lee, C., Morgan, G., Ottman, M., Ransom, J., & Wiersma, J. (2016). Harvest index and straw yield of five classes of wheat. Biomass and Bioenergy, 85, 223-227. doi:10.2016/j.biombioe.2015.12.023
• Fu, T., Ko, J., Wall, G. W., Pinter, Jr, P. J., Kimball, B. A., Ottman, M. J., & Kim, H. (2016). Simulation of climate change impacts on grain sorghum productiong grown under free air CO2 enrichment. International Astrophysics, 30, 311-322. doi:10.1515/intag-2016-0007
• Gleadow, R. M., Ottman, M. J., Kimball, B. A., Wall, G. W., Pinter, Jr, P. J., LaMorte, R. L., & Leavitt, S. W. (2016). Drought-induced changes in nitrogen partitioning between cyanide and nitrate in leaves and stems of sorghum grown at elevated CO2 are age dependent. Field Crops Research, 185, 97-102. doi:10.1016/j.fcr.2015.10.010
• Liu, B., Senthold, A., Muller, C., Ewert, F., Elliott, J., Lobell, D. B., Martre, P., Ruane, A. C., Wallach, D., Jones, J. W., Rozenzweig, C., Aggarwal, P. K., Alderman, P., Anothai, J., Basso, B., Biernath, C., Cammarano, D., Challinor, A. J., Deryng, D., , De Sanctis, G., et al. (2016). Similar estimates of temperature impacts on global wheat yield estimated by three independent methods. Nature Climate Change, 6, 1130-1137. doi:10.1038/ncclimate3115
• Webber, H., Ewert, F., Kimball, B., Siebert, S., White, J., Wall, G., Ottman, M., Trawally, D., & Gaiser, T. (2016). Simulating canopy temperature for modelling heat stress in cereals. Environmental Modelling & Software, 77, 143-155. doi:10.1016/jenvsoft.2015.12.003
• Dietterich, L. H., Zanobetti, A., Kloog, I., Huybers, P., Leakey, A. D., Bloom, A., Carlisle, E., Fernando, N., Fitzgerald, G., Hasegawa, T., Holbrook, N. M., Nelson, R. L., Norton, R., Ottman, M. J., Roboy, V., Sakai, H., Sartor, K. A., Schwartz, J., Seneweera, S., , Usui, Y., et al. (2015). Impacts of elevated atmospheric CO2 on nutrient content of important food crops. Scientific Data, 2, 150036. doi:http://dx.doi.org/10.1038/sdata.2015.36
• Kimball, B. A., White, J. W., Ottman, M. J., Wall, G. W., Bernacchi, C. J., Morgan, J., & Smith, D. P. (2015). Predicting Canopy Temperatures and Infrared Heater Energy Requirements for Warming Field Plots. Agronomy Journal, 107(1), 129-141. doi:10.2134/agronj14.0109
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  Corresponding author: BAK
• Mostafa, A. M., Ottman, M. J., Jason, R., & Burayu, W. (2015). Research Report Phosphorus Fertilizer Rate Effect on Alfalfa Yield and Soil Test P, Buckeye, 2014. University of Arizona Cooperative of Extension Publications, AZ 1672. 10 p..
• White, J. W., Alagarswamy, G., Ottman, M. J., Porter, C. H., Singh, U., & Hoogenboom, G. (2015). An overview of CERES-Sorghum as implemented in the cropping systems model version 4.5. Agronomy Journal, 107, 1-16.
• Asseng, S., Ewert, F., Marte, P., Rotter, R. P., Lobell, D. B., Cammarano, D., Kimball, B. A., Ottman, M. J., Wall, G. W., White, J. W., Reynolds, M. P., Alderman, P. D., Prasad, P. V., Aggarwal, P. K., Anothai, J., Basso, B., Biernath, C., Challinor, A. J., DeSanctis, G., , Doltra, J., et al. (2014). Rising temperatures reduce global wheat production. Nature Climate Change, 4.
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  Corresponding author: SA
• Martinez-Cruz, T. E., Slack, D. C., Ogden, K. L., & Ottman, M. J. (2014). The water use of sweet sorghum and development of crop coefficients. Irrigation and Drainage.
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  Corresponding author: TEM
• Myers, S. S., Zanobetti, A., Kloog, I., Huybers, P., Leakey, A. D., Bloom, A. J., Carlisle, E., Dietterich, L. H., Fitzgerald, G., Hasegawa, T., Holbrook, N. M., Nelson, R. L., Ottman, M. J., Raboy, V., Sakai, H., Sartor, K. A., Schwartz, J., Seneweera, S., Tausz, M., & Usui, Y. (2014). Increasing CO2 threatens human nutrition. Nature, 510(7503), 139-42.
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  Corresponding author: SSM
• Ogden, K. L., Slack, D. C., Ottman, M. J., & Cruz, T. E. (2014). The Water Use of Sweet Sorghum and Development of Crop Coefficients. Irrigation and Drainage.
• Ottman, M. J., Hunt, L. A., & White, J. W. (2013). Photoperiod and vernalization effects on anthesis date in winter-sown spring wheat regions. Agronomy Journal, 105, 1017-1025.
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  Corresponding author: MJO
• Wall, G. W., McLain, J. E., Kimball, B. A., White, J. W., Ottman, M. J., & Garcia, R. L. (2013). Infrared warming affects intrarow soil carbon dioxide efflux during vegetative growth of spring wheat. Agronomy Journal, 105, 607-618.
• Kimball, B. A., White, J. W., Wall, G. W., & Ottman, M. J. (2012). Infrared-warmed and Unwarmed wheat vegetation indices coalesce using canopy-temperature-based growing degree days. Agronomy Journal, 104(1), 114-118.
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  Corresponding author: BAK
• Ottman, M. J., Kimball, B. A., White, J. W., & Wall, G. W. (2012). Wheat growth response to increased temperature from varied planting dates and supplemental infrared heating. Agronomy Journal, 104(1), 7-16.
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  Corresponding author: MJO
• White, J. W., Kimball, B. A., Wall, G. W., & Ottman, M. J. (2012). Cardinal temperatures for wheat leaf appearance as assessed from varied sowing dates and infrared warming. Field Crops Research, 137, 213-220.
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  Corresponding author: JWW
• Grant, R. F., Kimball, B. A., Conley, M. M., White, J. W., Wall, G. W., & Ottman, M. J. (2011). Controlled warming effects on wheat growth and yield: Field measurements and modeling. Agronomy Journal, 103(6), 1742-1754.
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  Abstract: Climate warming may raise wheat (Triticum aestivum L.) yields in cooler climates and lower them in warmer climates. To understand these contrasting effects, infrared heating lamps were used to warm irrigated spring wheat by 1.5°C (day) and 3.0°C (night) above unheated controls during different times of the year at Maricopa, AZ. Changes in wheat growth with warming were used to test hypotheses for temperature effects on crop growth in the process model ecosys. Infrared heating substantially raised phytomass growth and grain yield under lower air temperature (T a) following plantings from September through December. The same heating, however, lowered growth and yield under higher T a following plantings from January through March. Gains in wheat yield of as much as 200 g C m-2 with heating under lower T a were attributed in the model to more rapid CO2 fixation and to reduced chilling effects on seed set. These gains were only partially off set by losses from shortened wheat growth periods. Losses in wheat yield of as much as 100 g C m-2 with heating under higher T a were attributed in the model to adverse effects of heating on crop water status and on CO2 fixation vs. respiration, to greater heat stress effects on seed set, and to shortened crop growth periods. Model hypotheses thus explained contrasting effects of heating on wheat yields under different T a found in the field experiment as well as in many earlier studies. Well-constrained tests of these hypotheses are vital for models used to project climate change impacts on agricultural ecosystems. © 2011 by the American Society of Agronomy.
• Grant, R., Kimball, B., Conley, M., White, J., Wall, G., & Ottman, M. (2011). Controlled warming effects on wheat growth and yield: Field measurement and modeling. Agronomy Journal, 103, 1742-1754.
• Ottman, M. J., White, J., Kimball, B., Wall, G., Ottman, ., & A, H. L. (2011). Responses of time of anthesis and maturity to sowing dates and infrared warming in spring wheat. Field Crops Research, 124, 213-222.
• Wall, G. W., Kimball, B. A., White, J. W., & Ottman, M. J. (2011). Gas exchange and water relations of spring wheat under full-season infrared warming. Global Change Biology, 17(6), 2113-2133.
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  Abstract: Gas exchange and water relations were evaluated under full-season in situ infrared (IR) warming for hard red spring wheat (Triticum aestivum L. cv. Yecora Rojo) grown in an open field in a semiarid desert region of the southwest USA. A temperature free-air controlled enhancement (T-FACE) apparatus utilizing IR heaters maintained canopy air temperature above 3.0m Heated plots of wheat by 1.3 and 2.7°C (0.2 and 0.3°C below the targeted set-points of Reference plots with dummy heaters) during daytime and nighttime, respectively. Control plots had no apparatus. Every 6 weeks during 2007-2009 wheat was sown under the three warming treatments (i.e., Control, Heated, Reference) in three replicates in a 3 × 3 Latin square (LSQ) design on six plantings during 4 months (i.e., January, March, September, December), or in a natural temperature variation treatment (i.e., Control) in three replicates in a randomized complete block (RCB) design on nine plantings during 7 months (i.e., January, February, April, June, July, August, October). Soil temperature (Ts) and volumetric soil-water content (θs) were 1.3°C warmer and 14% lower in Heated compared with Reference plots, respectively. Other than a 1% shading effect, no artifacts on gas exchange or water relations were associated with the IR warming apparatus. IR warming increased carbon gain characteristic of an increase in metabolic rates to higher temperature that may have been attributed to the well-watered wheat crop and the supplemental irrigation that minimized plant-to-air water vapor pressure differences between IR-warmed and nonwarmed plots. Nevertheless, seasonal oscillations in the IR warming response on carbon gain occurred. IR warming decreased leaf water status and provided thermal protection during freeze events. IR warming is an effective experimental methodology to investigate the impact of global climate change on agronomic cropping and natural ecosystems to a wide range of natural and artificially imposed air temperatures. Published 2011. This article is a US Government work and is in the public domain in the USA.
• Wall, G., Kimball, B. A., White, J., & Ottman, M. (2011). Gas exchange and water relations of spring wheat under full-season infrared warming. Global Change Biology, 17, 2113-2133.
• White, J. W., Kimball, B. A., Wall, G. W., Ottman, M. J., & Hunt, L. A. (2011). Responses of time of anthesis and maturity to sowing dates and infrared warming in spring wheat. Field Crops Research, 124(2), 213-222.
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  Abstract: Reliable prediction of the potential impacts of global warming on agriculture requires accurate data on crop responses to elevated temperatures. Controlled environments can precisely regulate temperature but may impose unrealistic radiation, photoperiod and humidity regimes. Infrared warming with automatic control of temperature rise has shown potential for warming field plots above ambient temperatures, while avoiding such biases. In a field experiment conducted at Maricopa, AZ, we assessed the utility of a temperature free-air controlled enhancement (T-FACE) approach by comparing phenology of wheat from a series of six sowing date treatments using T-FACE and an additional nine sowing dates that exposed crops to an exceptionally wide range of air temperatures (40°C). The T-FACE treatments were intended to achieve a warming of +1.5°C during the daytime and +3.0°C at night; the achieved warming averaged +1.3°C during daytime and +2.8°C at night. T-FACE and sowing date treatments had large effects on phenology. A regression-based analysis of simulations with the CSM-CROPSIM-CERES model showed that effects of T-FACE on phenology were similar to what would be expected from equivalent changes in air temperature. However, systematic deviations from the expected 1-to-1 relation suggested that assumed cardinal temperatures for phenology should be revised. Based on the single cultivar and location, it appeared that the base temperature for emergence to anthesis should be reduced from 0°C to -5°C, whereas the base temperature for grain filling should be increased from 0°C to 4°C and the optimal temperature, from 30°C to 34°C. Both T-FACE and extreme sowing date treatments proved valuable for improving understanding of high temperature effects on plant processes, as required for accurate prediction of crop responses to elevated temperatures under climate change. © 2011.
• Miller, A. N., & Ottman, M. J. (2010). Irrigation frequency effects on growth and ethanol yield in sweet sorghum. Agronomy Journal, 102(1), 60-70.
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  Abstract: With the increasing costs of fossil fuels, new methods of generating renewable fuels need to be researched and developed. This study was undertaken to assess the effects of irrigation frequency on crop growth and ethanol yield of sweet sorghum [Sorghum bicolor (L.) Moench]. Nine combinations of pre- and postanthesis irrigation frequencies triggered by 35, 50, or 65% depletion of plant-available soil water were established in Tucson, AZ. Soil type was a Gila very fine sandy loam. Water application plus pre- cipitation ranged from 1075 to 1394 mm. Crop water use was greatest with the most frequent irrigation treatment (35% depletion all season) (1067 mm), while the 50 and 65% depletion treatments (all season) were not different (882 and 844 mm, respectively). Despite increased biomass at the V-17 and anthesis stages, no differences due to irrigation frequency were found at harvest for yield of biomass or ethanol. The 65% and 50% depletion treatments (all season) returned more biomass per unit of water applied than the 35% depletion treatment (all season) (21.9, 21.6, and 18.8 kg ha1 mm1, respectively). A difference in total sugar con- centration was not found at harvest, implying that water stress does not increase the sugar concentration in sweet sorghum, or the stress imposed in our study (24% reduction in postanthesis water use) was not sufficient to do so. Irrigating sweet sorghum more frequently than at 50% depletion does not increase ethanol yield and reduces biomass produced per unit of water.
• Ottman, M. J. (2009). Water use in biofuel crop production. ACS National Meeting Book of Abstracts.
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  Abstract: Biofuel production has increased in the US due to government policy of energy independence and security. Ethanol can be produced from a variety of crops including grain, sugar, cellulose, and oil seed crops. The primary biofuel crop in the US, corn, uses less water than some crops but more than others. Producing corn for biofuels in the US has resulted in less irrigation water application to crops, since corn is irrigated with less water than the crops it has replaced, such as cotton. By 2030, water withdrawals for biofuel crops are projected at 4% of the total worldwide, but will be 22% of the total in the US, or 2-3 times that amount depending on irrigation water application to cellulosic ethanol crops.
• Hunsaker, D. J., Fitzgerald, G. J., French, A. N., Clarke, T. R., Ottman, M. J., & Pinter Jr., P. J. (2007). Wheat irrigation management using multispectral crop coefficients: I. Crop evapotranspiration prediction. Transactions of the ASABE, 50(6), 2017-2033.
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  Abstract: A method widely used for irrigation management determines crop evapotranspiration (ET c) from reference evapotranspiration (ET o) calculations and estimated crop coefficients. However, standard time-based crop coefficients may fail to represent the actual crop water use, for example, when deviations in weather or agronomic constraints appreciably change crop development patterns from typical conditions. In this study, the FAO-56 dual crop coefficient procedures were applied during experiments with wheat to calculate the estimated ET c for irrigation scheduling. The objective of this research was to determine whether basal crop coefficients (K cb) determined from a normalized difference vegetation index (NDVI treatment) improve the prediction of ET c over a standard application with a locally developed time-based K cb curve (FAO treatment). The experiments conducted for two seasons in central Arizona included subtreatments, equally replicated within the NDVI and FAO treatments, of three plant densities (typical, dense, and sparse) and two nitrogen levels (high and low) to provide a range of crop development and water use conditions. The effects of plant density and N level resulted in significant differences in measured seasonal ET c. Large variations that occurred in the observed K cb and ET c trends between subtreatments were better correlated with the NDVI than the FAO treatment. The mean absolute percent difference for predicted ET c was significantly smaller for NDVI than FAO during both seasons. The treatment difference was 5% for the first season, but 10% for the second season when an unexpected early decline in ET c and K cb was effectively predicted by the NDVI treatment but not by the FAO treatment. NDVI appears to be a robust approach for K cb estimation of wheat, able to reliably predict actual ET c for both typical and abnormal water use conditions.
• Hunsaker, D. J., Fitzgerald, G. J., French, A. N., Clarke, T. R., Ottman, M. J., & Pinter Jr., P. J. (2007). Wheat irrigation management using multispectral crop coefficients: II. Irrigation scheduling performance, grain yield, and water use efficiency. Transactions of the ASABE, 50(6), 2035-2050.
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  Abstract: Current irrigation scheduling is based on well-established crop coefficient and reference evapotranspiration procedures to estimate daily crop evapotranspiration (ET c). Effective irrigation scheduling and efficient irrigation water use can occur when ET c is calculated with crop coefficients representative of actual crop water use conditions. The objective of this research was to evaluate irrigation scheduling using two approaches to estimate the basal crop coefficient (K cb) during wheat experiments conducted in 2003-2004 and 2004-2005 at Maricopa, Arizona. Each K cb approach (main treatment) included six subtreatment combinations (three plant densities and two N managements) imposed to create spatial and temporal variations in water use among experimental plots. The first approach (NDVI treatment) estimated K cb separately for each plot based on normalized difference vegetation index (NDVI) data obtained by frequent canopy reflectance measurements. The second approach (FAO treatment) estimated K cb, uniformly for all plots based on a K cb, curve developed for standard wheat conditions. The K cb estimates were incorporated within the FAO-56 dual crop coefficient procedures to calculate daily ET c and root zone soil water depletion (D r). Plot irrigations were provided when the predicted D r reached 45% of the available soil water. During both wheat experiments, considerable variations in measured soil water depletion were observed for subtreatments due to differences in crop water use rates. For the FAO treatment, mean absolute percent difference (MAPD) for predicted D r was 27% and 40% for 2003-2004 and 2004-2005, respectively. Prediction of D r was improved significantly for NDVI for both experiments where treatment MAPD was 17% (2003-2004) and 18% (2004-2005). Although mean irrigation application efficiency for NDVI (89%) and FAO (88%) was similar for 2003-2004, it was significantly higher for NDVI (86%) than FAO (77%) for 2004-2005.Differences for irrigation scheduling resulted in significantly lower seasonal irrigation water use for the NDVI than FAO treatment, 8% (2003-2004) and 13% (2004-2005), but did not result in appreciable treatment differences for seasonal ET c, final grain yield, and crop water use efficiency (yield per unit ET c). Consequently, a primary outcome for both experiments was significantly higher irrigation water use efficiency (yield per unit irrigation water) for NDVI than FAO. Incorporating Kd, estimates based on NDVI within existing crop coefficient algorithms provides an opportunity to improve wheat irrigation scheduling strategies for conserving irrigation water while maintaining grain yield potentials.
• Ottman, M. J., Thompson, T. L., & Doerge, T. A. (2006). Alfalfa yield and soil phosphorus increased with topdressed granular compared with fluid phosphorus fertilizer. Agronomy Journal, 98(4), 899-906.
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  Abstract: Fluid P fertilizers are commonly applied to established alfalfa (Medicago sativa L.) despite their higher cost compared So granular forms. The objectives of this experiment were to compare effects of fluid and granular P fertilizer on alfalfa yield, and availability and movement of P in the soil. The P fertilizers compared were fluid ammonium polyphosphate (APP, 10-34-0) applied in irrigation water and granular monoammonium phosphate (MAP, 11-52-0) topdressed and incorporated by flood irrigation on a calcareous soil at Maricopa, AZ. Fertilizer P was applied each December at rates of 1,2,3, and 5 g P m -2. The soil was sampled about 1 mo later. In the first foinr cuttings of the first year, hay yields were 1358 g m-2 for APP and 1501 g m-2 for MAP. No differences in yield due to P source were measured in the remaining four cuttings of the first year, or in any editing the second or tliird year. In the surface soil (0-7.6 cm), the bicarbonate-extract able soil P averaged 44 mg kg-1 for APP and 7.1 for MAP. The depth of movement of the fertilizers was similar except in the first year where MAP moved deeper into the soil profile than APP. In this study, the higher cost of fluid APP compared with granular MAP was not recovered by increased yield However, at low P rates, water-run APP may be more economical than topdressed MAP due to its low application cost. © American Society of Agronomy.
• Thompson, T. L., Ottman, M. J., & Riley-Saxton, E. (2004). Basal stem nitrate tests for irrigated malting barley. Agronomy Journal, 96(2), 516-524.
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  Abstract: Nitrogen fertilizer use is essential for optimizing yield of irrigated malting barley (Hordeum vulgare L.) but must be managed carefully to achieve optimum grain protein concentrations demanded by the malting industry. Development of tissue tests, applicable for growing conditions in the desert Southwest, would be of benefit to growers for optimizing yield and grain protein of irrigated malting barley. Field experiments were conducted with two cultivars of malting barley [Morex (six row) and Crystal (two row)] under irrigated conditions in southern Arizona. The objectives were to (i) determine yield and grain protein response to N applications, (ii) determine the relationship between lower-stem tissue and sap NO3-N, and (iii) develop lower-stem and sap NO3 test guidelines for N management in malting barley. Yields ≥90% of maximum relative yield and grain protein concentrations acceptable for malting were achieved at N rates (kg ha -1) of 242 to 269 (1997-1998) and 205 to 269 (1998-1999) for Morex and 162 to 178 (1997-1998) and 166 to 181 (1998-1999) for Crystal. Stem and sap NO3-N were significantly correlated in both cultivars, with r 2 values of 0.72 in Morex and 0.82 in Crystal. We propose that, to achieve acceptable grain yield and protein, lower-stem sap NO3-N in malting barley should be no less than 300, 180, and 120 mg L-1 and dry stem tissue NO3-N should be no less than 3000, 1000, and 800 mg kg-1 at Feekes growth stages 3, 7, and 10, respectively.
• Derner, J. D., Johnson, H. B., Kimball, B. A., Pinter Jr., P. J., Polley, H. W., Tischler, C. R., Boutton, T. W., Lamorte, R. L., Wall, G. W., Adam, N. R., Leavitt, S. W., Ottman, M. J., Matthias, A. D., & Brooks, T. J. (2003). Above- and below-ground responses of C₃-C₄ species mixtures to elevated CO₂ and soil water availability. Global Change Biology, 9(3), 452-460.
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  Abstract: We evaluated the influences of CO2 [Control, ∼ 370 μmol mol-1; 200 μmol mol-1 above ambient applied by free-air CO2 enrichment (FACE)] and soil water (Wet, Dry) on above- and below-ground responses of C3 (cotton, Gossypium hirsutum) and C4 (sorghum, Sorghum bicolor) plants in monocultures and two density mixtures. In monocultures, CO2 enrichment increased height, leaf area, above-ground biomass and reproductive output of cotton, but not sorghum, and was independent of soil water treatment. In mixtures, cotton, but not sorghum, above-ground biomass and height were generally reduced compared to monocultures, across both CO2 and soil water treatments. Density did not affect individual plant responses of either cotton or sorghum across the other treatments. Total (cotton + sorghum) leaf area and above-ground biomass in low-density mixtures were similar between CO2 treatments, but increased by 17-21% with FACE in high-density mixtures, due to a 121% enhancement of cotton leaf area and a 276% increase in biomass under the FACE treatment. Total root biomass in the upper 1.2 m of the soil was not influenced by CO2 or by soil water in monoculture or mixtures; however, under dry conditions we observed significantly more roots at lower soil depths (> 45 cm). Sorghum roots comprised 81-85% of the total roots in the low-density mixture and 58-73% in the high-density mixture. CO2-enrichment partly offset negative effects of interspecific competition on cotton in both low- and high-density mixtures by increasing above-ground biomass, with a greater relative increase in the high-density mixture. As a consequence, CO2-enrichment increased total above-ground yield of the mixture at high density. Individual plant responses to CO2 enrichment in global change models that evaluate mixed plant communities should be adjusted to incorporate feedbacks for interspecific competition. Future field studies in natural ecosystems should address the role that a CO2-mediated increase in C3 growth may have on subsequent vegetation change.
• Davies, C. S., Ottman, M. J., & Peloquin, S. J. (2002). Can germplasm resources be used to increase the ascorbic acid content of stored potatoes?. American Journal of Potato Research, 79(4), 295-299.
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  Abstract: Freshly harvested potato tubers contain up to 50 mg/100g ascorbic acid (AA), but levels decline rapidly during cold storage. Genetic alterations to boost the AA content of stored tubers would contribute to human nutrition and might improve tuber resistance to oxidative damage during chilling. While studying the breeding potential of Solanum phureja germplasm, we identified a 24-chromosome Phureja-haploid Tuberosum hybrid (clone I, US-W5295.7) that retained a twofold higher content of tuber AA than neighboring clones after storage at 5 C. Clone I produces 2n-pollen through a mechanism genetically equivalent to first-division restitution (FDR), which transmits much of the nonadditive genetic variance for tuber yield. We now report a survey of clone I progeny showing significant family and ploidy effects on tuber AA levels during cold storage, consistent with the transmission of information for higher AA by FDR 2n-pollen. These results encourage further study of 2n-gametes and wild species germplasm to breed for increased tuber AA.
• Ottman, M. J., & Pope, N. V. (2000). Nitrogen fertilizer movement in the soil as influenced by nitrogen rate and timing in irrigated wheat. Soil Science Society of America Journal, 64(5), 1883-1892.
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  Abstract: Nitrogen fertilizer is a potential contaminant of groundwater supplies. The purpose of this study was to determine the influence of recommended N fertilizer rate and timing on N movement in the soil during the growing season. Durum wheat [Triticum turgidum L. subsp, durum (Desf.) Husn.] was grown at Maricopa, AZ, during the 1991 and 1992 growing seasons. A N rate study was conducted at two sites on a sandy loam soil [coarse loamy, mixed (calcareous), hyperthermic, Typic Natrargid (reclaimed)] and clay loam soil [fine loamy, mixed (calcareous), hyperthermic, Typic Torrifluvent] using 15N-labeled (NH4)2SO4 and Br- tracer. Three N rates that ranged from 5.4 to 10.1 g N m-2 for the less than recommended rate, 18.5 to 22.5 g N m-2 for the recommended rate and 28.0 to 37.8 g N m-2 for the greater than recommended rate were applied in split applications. The experimental design was a randomized complete block with six replications and three N rates. A N timing study was conducted on the sandy loam soil at the recommended N rate where 15N and Br- were applied at only one of the application times and nonlabeled N fertilizer was applied at the other times. The experimental design for the N timing study was a randomized complete block with six replications and four (1992) or five (1991) application times. Surface flood irrigation was applied in excess of soil water depletion (top 1.5 m), varying with year, soil type, and N rate. After harvest, the soil was sampled to a depth of 2.4 m and analyzed for 15N and Br-. Nitrogen rate had no influence on 15N fertilizer or Br- movement in the soil. Nitrogen rate increased the N content of the surface soil, but most of this N was not in NO3 form. In most cases, the median depth of movement of recovered 15N for all N rates was 0.23 m compared to 1.13 m for Br-. Timing of applications did not influence N fertilizer movement. Bromide overestimated the depth of 15N movement recovered in the soil possibly due to plant uptake and immobilization of N in the surface soil. We found that for irrigated wheat in Arizona, most of the N fertilizer recovered in the top 2.4 m of soil was in the surface soil, regardless of N fertilizer practices.
• Ottman, M. J., Doerge, T. A., & Martin, E. C. (2000). Durum grain quality as affected by nitrogen fertilization near anthesis and irrigation during grain fill. Agronomy Journal, 92(5), 1035-1041.
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  Abstract: Nitrogen fertilization and irrigation practices can affect durum [Triticum turgidum subsp. durum (Desf.) Husn.] grain quality, especially protein content. The purpose of this study was to determine if irrigation frequency during grain fill influences the effectiveness of N applied near anthesis in increasing durum grain quality. A field study was conducted at Maricopa, AZ on a Casa Grande sandy loam soil (fine-loamy, mixed, superactive, hyperthermic, Typic Natrargid). Durum was grown with recommended amounts of N fertilizer until anthesis when 0, 3.4, and 6.7 g N m-2 were applied and irrigation based on 39, 50, and 70% depletion of plant-available soil water was initiated, irrigation during grain fill had no effect on grain yield or grain quality except in 1996, when irrigating at 30, 50, and 70% depletion resulted in hard vitreous amber counts (HVAC) of 813, 870, and 934 g kg-1, respectively. Nitrogen application near anthesis of 0, 3.4, and 6.7 g N m-2 resulted in grain protein contents of 115, 127, and 140 g kg-1 in 1995 and 132, 141, and 151 g kg-1 in 1996, respectively. Nitrogen application near anthesis increased grain protein yield and HVAC in both years of rite study and increased grain yield, grain volume weight, and kernel size in 1995. The results of this study suggest that N fertilizer application near anthesis has a primary influence on durum quality and that effects of irrigation frequency during grain fill are inconsistent or relatively minor.
• Ottman, M. J., Tickes, B. R., & Roth, R. L. (1996). Alfalfa yield and stand response to irrigation termination in an arid environment. Agronomy Journal, 88(1), 44-48.
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  Abstract: Alfalfa (Medicago sativa L.) irrigation is often withheld as a water conservation measure in arid regions. The objective of this research was to test the hypothesis that alfalfa yields and stands can be permanently damaged by withholding irrigation water in arid environments. Irrigation termination studies were conducted on a Superstition sand (sandy mixed, hyperthermic Typic Calciorthid; 95% sand) in Yuma, AZ, and on a Casa Grande sandy loam [coarse-loamy, mixed (calcareous), hyperthermic Typic Natrargid (reclaimed)] at Maricopa, AZ. Irrigations were terminated in the summer (July through October) and winter (November through February) in Yuma and in the summer (August through September) and summer, fall, and winter (August through mid-March) in Maricopa. Summer irrigation termination at the Yuma site reduced stand from 43 to 16 plants m-2 and reduced hay yield from 1.50 to 0.52 Mg ha-1 per cutting after irrigation was resumed. Irrigation termination at the Maricopa site was not detrimental to stands, although hay yields per cutting were depressed from 2.90 to 2.52 Mg ha-1 following the second cycle of summer irrigation termination and from 3.10 to 2.43 Mg ha-1 following the second cycle of summer through winter irrigation termination. Winter irrigation termination at Yuma had no residual effect on yield or stand. Alfalfa water use was reduced by irrigation termination at Maricopa, even after irrigation was resumed. Total nonstructural carbohydrates in the roots were not consistently higher or lower than the control during irrigation termination. Termination of alfalfa irrigation as a water-conserving measure is not always advisable in and environments due to the possibility of permanent crop damage.
• Jama, A. O., & Ottman, M. J. (1993). Timing of the first irrigation in corn and water stress conditioning. Agronomy Journal, 85(6), 1159-1164.
• Day, A. D., Solomon, M. A., Ottman, M. J., & Taylor, B. B. (1990). Sewage sludge loading rates for wheat production in an arid environment. Journal of Arid Environments, 19(2), 235-239.
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  Abstract: Evaluated the effects of sewage sludge loading rates on growth, yield, and heavy metal content on durum wheat Triticum durum grown in Brazito sandy loam soil. Wheat fertilized with the recommended rate of inorganic N and equivalent amounts of plant-available N from sewage sludge was similar in vegetative growth, grain yield and straw yield. Sewage sludge rates higher than the recommended plant-available N level resulted in slight increases in grain yield and number of days to heading. Sludge rates >3 times the recommended plant-available N level decreased the stand during the seedling stage. The loss of stand was compensated for, later in the season, by higher tillering. Cadmium, Cu, Pb, Ni and Zn accumulations in wheat grain and straw and in the soil following each harvest were low and similar for all fertilizer treatments. -from Authors

Proceedings Publications

• Quist, A., & Ottman, M. J. (2014, December). Managing alfalfa nutrition by soil analysis in the desert southwestern United States. In California Alfalfa, Forage, and Grain Symposium.
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  Corresponding author: AQ
• White, J. W., Ottman, M. J., Wall, G. W., & Kimball, B. A. (2014, November). Field-Based Characterization of Crop Responses to Temperature. In American Society of Agronomy Annual Meeting, 1.
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  Corresponding author: JWW
• Jakarat, A., Ottman, M., Salazar, M., Green, A., Kimball, B., & Hoogenboom, G. (2013, November). Performance evaluation of the CSM-CERES-Maize and CSM-IXIM-Maize Models for simulating maize response to high temperature and drought stress under arid conditions. In Agronomy Abstracts.
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  Corresponding author: AK
• Kimball, B. A., White, J. W., Wall, G. W., & Ottman, M. J. (2013, June). Exposing wheat to a wide range of temperatures: The hot serial cereal experiment. In Modeling Wheat Response to High Temperature, AgMIP Wheat multi-model comparison with Hot Serial Cereal experiment, 19-21 June 2013, CIMMYT, El Batan, Mexico.
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  Corresponding author:
• Kimball, B. A., White, J. W., Wall, G. W., & Ottman, M. J. (2013, November). Wheat respose to a wide range of temperatures: The hot serial cereal experiment. In Agronomy Abstracts.
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  Corresponding author: BAK
• Ottman, M. J., & Putnam, D. (2013, December). Long term trends and the future of the alfalfa and forage industry. In Proceedings, Western Alfalfa & Forage Symposium, Reno, NV, 11-13 December, 2013. UC Cooperative Extension, Plant Sciences Department, University of California, Davis, CA 95616..
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  Corresponding author: MJO
• Wall, G. W., Kimball, B. A., White, J. W., & Ottman, M. J. (2013, June). Ecosystem warming affects mass and energy exchange processes in spring wheat. In Modeling Wheat Response to High Temperature, AgMIP Wheat multi-model comparison with Hot Serial Cereal experiment 19-21 June 2013, CIMMYT, El Batan, Mexico.
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  Corresponding author: GWW
• Wall, G. W., Kimball, B. A., White, J. W., & Ottman, M. J. (2013, October). Infrared warming affects leaf gas exchange and water relations of srping wheat. In 4th Annual AgMIP Global Workshop, 28-30 October, 2013, New York City..
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  Corresponding author: GWW
• Anothai, J., Tojo, S. C., Green, A., Ottman, M., Kimball, B., & Hoogenboom, G. (2012, Fall). Evaluating the Response of CSM-CERES-Maize to High Temperature and Drought Stress Under Field Conditions. In Annual Meeting of the American Society of Agronomy.
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  Corresponding author: JA
• Girma, K., Okwany, R., Fransen, S., Peters, T., Pan, W., Ottman, M., Collins, H., & Davenport, J. (2012, Fall). Soil Profile Nitrogen Under Different Biofuel Feedstock Grasses and Irrigation Regimes in the Irrigated Arid Pacific Northwest. In Annual Meeting of the American Society of Agronomy.
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  Corresponding author: MJO
• Martinez-Cruz, T., Slack, D., Ogden, K., & Ottman, M. (2012, May). The effects of water stress on sweet sorghum (Sorghum bicolor (L.) Moench) and the development of crop coefficients. In 4th KKU International Engineering Conference.
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  Corresponding author: TEM
• Martinez-Cruz, T., Slack, D., Ogden, K., & Ottman, M. (2012, May). The effects of water stress on sweet sorghum (Sorghum bicolor (L.) Moench) and the development of crop coefficients. In The 4th KKU International Engineering Conference.
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  05/10/-05/12/2012
• Ottman, M., Ottman, M., Munier, D., Munier, D., Orloff, S., & Orloff, S. (2012, December). Irrigation management for wheat. In 42nd California Alfalfa & Grains Symposium.
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  Corresponding author: MJO
• Slack, D., Martinez-Cruz, T., Ogden, K., Ottman, M., & Husman, S. (2012, May). Sweet sorghum as an energy crop. In The 4th KKU International Engineering Conference.
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  Corresponding author: DS
• Ottman, M. (2011, December). Irrigation cutoffs with alfalfa What are the implications?. In 41st Western Alfalfa & Forage Symposium, Las Vegas, Nevada, Department of Agronomy and Range Science Extension, University of California, Davis, CA 95616, 136-138.
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  2011 December 11-13
• Ottman, M. (2011, December). Irrigation cutoffs with alfalfa What are the implications?. In 41st Western Alfalfa & Forage Symposium, 136-138.
• White, J., Kimball, B., Wall, G., & Ottman, M. (2011, Fall). Dynamics of wheat leaf appearance under diverse thermal regimes. In Not provided in APROL.

Presentations

• Ottman, M. J. (2018, February). Updates in alfalfa irrigation practices. Parker Ag Workshop. Parker: University of Arizona Cooperative Extension.
• Ottman, M. J. (2018, January). Deficit irrigation of alfalfa. 2018 Southwest Hay & Forage Conference. Ruidoso, NM: New Mexico Hay Association and New Mexico State University.
• Ottman, M. J. (2018, October). Extension Dairy Forage Initiative. Agriculture and Natural Resources In-service Training. Maricopa: University of Arizona Cooperative Extension.
• Ottman, M. J. (2018, September). Water and fertility management of alfalfa and its implications for pest control. Alfalfa Meeting. Parker: University of Arizona Cooperative Extension.
• Ottman, M. J. (2018, September). Water and fertility management of alfalfa and its implications for pest control. Alfalfa Production Meeting. Blythe, CA: University of Callifornia Cooperative Extension.
• Ottman, M. J., & Putnam, D. (2018, November). Nitrogen Management in Grassy Forage Crops. Producing Healthy Forage Systems 2018 California Alfalfa & Forage Symposium & Soil Health and Fertility Workshop. Reno, NV: University of California Cooperative Extension.
• Ottman, M. J., Putnam, D., & Hays, T. (2018, November). Economics of Fertilizer Management. Producing Healthy Forage Systems 2018 California Alfalfa & Forage Symposium & Soil Health and Fertility Workshop. Reno, NV: University of California Cooperative Extension.
• Andrade-Sanchez, P., White, J. W., & Ottman, M. J. (2016, June 2). University of Arizona's Field Scanalyzer. TERRA Inaugural Field Day. Maricopa Ag Center: University of Arizona and arpa-e (DOE).
• Maiorano, A., Martre, P., Asseng, S., Ewert, F., Muller, C., Rotter, R. P., Ruane, A. C., Seminov, M. A., Wallach, D., Wang, E., Alderman, P. D., Kassie, B. T., Biernath, C., Basso, B., Camarrano, D., Challinor, A. J., Doltra, J., Dumont, B., Gayler, S., , Kersebaum, K. C., et al. (2016, March). Model improvements reduce the uncertainty of wheat crop model ensembles under heat stress. International Crop Modeling Symposium. Berlin: Leibniz Centre for Agricultural Landscape Research (ZALF).
• Ottman, M. J. (2016, April 27). Irrigation management strategies. Alfalfa Meeting. Parker, AZ: La Paz County Cooperative Extension.
• Ottman, M. J. (2016, February 25). Strategies to reduce irrigation water application to alfalfa. Southwest Ag Summit. Yuma, AZ: Yuma County Cooperative Extension.
• Ottman, M. J. (2016, January 27). When to apply P fertilizer to alfalfa. Field crops clinic. Buckeye, AZ: Maricopa County Cooperative Extension.
• Ottman, M. J. (2016, January 28). Trade-offs among water and fertilizer cost and yield and protein in wheat. Field crops clinic. Casa Grande, AZ: Pinal County Cooperative Extension.
• Ottman, M. J. (2016, March 16). Alfalfa irrigation cutoff strategies. The 2nd Arizona Alfalfa & Forage Crops Workshop. Maricopa, AZ: Maricopa County Cooperative Extension.
• Ottman, M. J. (2016, March 2). Fertility management for small grains for optimum yield and quality. Farm, Home, and Ranch Day. Thatcher, AZ: Graham County Cooperative Extension.
• Ottman, M. J. (2016, May 11). Small grains trials at Maricopa. Small Grains Field Day. Maricopa, AZ: Maricopa County Cooperative Extension.
• Ottman, M. J. (2016, May 7). Cropping considerations. Soil, plants, and water. Wheatfields, AZ: Dine College.
• Ottman, M. J. (2016, October 19). Alfalfa varieties. La Paz County Alfalfa Meeting. Parker, AZ: La Paz County Cooperative Extension.
• Ottman, M. J., Frisvold, G., Diaz, D., & Putnam, D. (2016, August 11). Why do we grow alfalfa in Arizona?. 2016 Arizona Cooperative Extension Water Conference / In-Service. Tempe, AZ: UA Cooperative Extension.
• Ottman, M., & Andrade-Sanchez, P. (2016, October 26). The TERRA-REF project: The potential for using sensing to assess crop growth for crop improvement and crop management. The 6th Annual Central Arizona Farmer Field Day. Maricopa Ag Center: University of Arizona Maricopa County Cooperative Extension.
• Ottman, M., Rovey, J., & Mostafa, A. (2016, July 7). Alfalfa P fertilizer test at Rovey's. Alfalfa "Tent Talks" Meeting. Buckeye: University of Arizona Maricopa County Cooperative Extension.
• Wang, E., Martre, P., Asseng, S., Ewert, F., Zhao, Z., Muller, C., Maiorano, A., Rotter, R. P., Kimball, B. A., Ottman, M. J., Wall, G. W., White, J. W., Aggarwal, P. K., Alderman, P. D., Anothai, J., Basso, B., Biernath, C., Camarrano, D., Challinor, A. J., , DeSanctis, G., et al. (2016, March). Canopy temperature for simulation of heat stress in irrigated wheat in a semi-arid environment: a multi-model comparison. International Crop Modeling Symposium. Berlin: Leibniz Centre for Agricultural Landscape Research (ZALF).
• Webber, H., Martre, P., Asseng, S., Kimball, B., White, J., Ottman, M., Wall, G. W., DeSanctis, G., Doltra, J., Grant, R., Kassie, B., Maiorano, A., Olesen, J. E., Ripoche, D., Rezaei, E. E., Semenov, M. A., Stratonovitch, P., & Ewert, F. (2016, March, 2016). Canopy temperature for simulation of heat stress in irrigated wheat in a semi-arid environment: A multi-model comparison. International Crop Modelling Symposium. Berlin: Leibniz Centre for Agricultural Landscape Research (ZALF).
• Martre, P., Asseng, S., Ewert, F., Rotter, R., Lobell, D., Cammarano, D., Kimball, B., Ottman, M., Wall, G., White, J., Reynolds, M., Alderman, P., Prasad, V., Aggarwal, P., Anothai, J., Basso, B., Biernath, C., Challinor, A., De Sanctis, G., , Doltra, J., et al. (2015, April 8-9, 2015). Reducing uncertainty in prediction of wheat performance under climate change. MACSUR Conference 2015: Integrated Climate Risk Assessment in Agriculture & Food. University of Reading, UK: MACSUR - Modelling European Agriculture with Climate Change for Food Security.
• Ottman, M. (2015, October 28). Forage sorghum irrigation, row spacing, nitrogen fertilizer, and hybrid trials. The 5th Annual Central Arizona Farmer Field Day. Maricopa Ag Center: University of Arizona Maricopa County Cooperative Extension.
• Ottman, M. (2015, September 16). Small Grains Management. Field Crops "Tent Talks" Meeting. Marana, AZ: University of Arizona Pima County Cooperative Extension.
• Ottman, M. J. (2015, June 3). New developments in alfalfa fertilizer research. New technologies for Arizona field crops workshop. Maricopa Ag Center.
• Ottman, M. J. (2015, March 31). Alfalfa variety pest resistances and dormancy classes. Alfalfa Pest Management Meeting. Parker, AZ: La Paz County Cooperative Extension.
• Ottman, M., Rovey, J., & Mostafa, A. (2015, July 8). Alfalfa fertilizer studies on the Jason Rovey farm. Alfalfa "Tent Talks" Meeting. Buckeye: University of Arizona Maricopa County Cooperative Extension.
• Ottman, M., Rovey, J., & Mostafa, A. (2015, July 9). Alfalfa fertilizer studies. Alfalfa and Cotton "Tent Talks" Meeting. Maricopa, AZ: University of Arizona Pinal County Cooperative Extension.
• Ottman, M. J. (2014, April). Alfalfa Varieties: Past, Present, and Future. Alfalfa Production in the Mexicali Valley, MX. Mexicali, MX: Autonomous University of Baja California.
• Ottman, M. J. (2014, April). Crop Considerations/Soil Considerations. Plant Soil and Irrigation – Getting Ready for the 2014 Cropping Season Meeting. Wheatfields, AZ: Dine College.
• Ottman, M. J. (2014, August). Soil test interpretations. Plant Soil and Irrigation Meeting. Wheatfields, AZ: Dine College.
• Ottman, M. J. (2014, December). Leaf hopper resistant alfalfa varieties. Alfalfa Leaf Hopper Meeting. Mohave Valley: Arizona Cooperative Extension.
• Ottman, M. J. (2014, February). High Residue Farming in Arizona. High Residue Farming Workshop. Salt Lake City: Sustainable Agriculture Research and Education Program.
• Ottman, M. J. (2014, February). Irrigation Cutoffs with Alfalfa – What are the Implications?. Alfalfa grower seminar. Santo Domingo Valley, Baja California Sur, Mexico: National Institute for Investigations into Forestry, Agriculture, and Livestock (INIFAP).
• Ottman, M. J. (2014, February). Irrigation Practices and Fertilizer Recommendations for Arizona Alfalfa Production. Southwest Ag Conference. Yuma: Yuma vegetable industry.
• Ottman, M. J. (2014, July). Alfalfa nutrient and water management and stress. Alfalfa “Tent Talks” Meeting. Buckeye: Arizona Cooperative Extension.
• Ottman, M. J. (2014, July). Summer slump and pest management. Summer Pest Management Workshop. Parker: Arizona Cooperative Extension.
• Ottman, M. J. (2014, July). Summer slump in alfalfa. Summer Ag Management Workshop. Yuma: Arizona Cooperative Extension.
• Ottman, M. J. (2014, June). Aflatoxin. Webinar. Tucson: Arizona Farm Bureau.
• Ottman, M. J. (2014, June). What is new in crop management practices and varieties?. New Technologies for Arizona Field Crops Workshop. Maricopa: Arizona Cooperative Extension.
• Ottman, M. J. (2014, March). Forage Sorghum Management/ Lodging Control in Small Grains. Field Crops Meeting. Casa Grande: Arizona Cooperative Extension.
• Ottman, M. J. (2014, March). Forage Sorghum Management/ Lodging Control in Small Grains. Field Crops Meeting. Marana: Arizona Cooperative Extension.
• Ottman, M. J. (2014, March). N Flux – The Importance of Timing N Applications on Desert Crops. Southwest Desert Region Nutrient Seminar. Yuma: Western Plant Health Association (WPHA).
• Ottman, M. J. (2014, March). Water and Nitrogen Needs for Forage Sorghum/ Alfalfa Crop Management Including Water. Field Crops Clinic. Avondale: Arizona Cooperative Extension.
• Ottman, M. J. (2014, May). Reduced irrigation strategies for Arizona alfalfa production. Early Summer La Paz County Agronomic Workshop. Parker: Arizona Cooperative Extension.
• Ottman, M. J. (2014, October). Alfalfa rooting characteristics as seen in a soil pit. 4th Annual Central Arizona Farmer Field Day. Maricopa: Arizona Cooperative Extension.
• Ottman, M. J. (2014, October). Plant and soil tissue testing for small grains. Soil Health In-service Training,. Maricopa: NRCS/Arizona Cooperative Extension.
• Ottman, M. J. (2013, December). Long Term Trends and the Future of the Alfalfa and Forage Industry. Western Alfalfa and Forage Symposium, Reno, NV. Reno, NV: UC Alfalfa Working Group.
• Ottman, M. J. (2013, February). Crop and Pest Management in Small Grains. Farm, Home, and Ranch Day, Thatcher, AZ. Thatcher, AZ: UA Coop Ext.
• Ottman, M. J. (2013, February). Irrigation of Small Grains. Arizona Cooperative Extension Field Crops Clinic, Gilbert, AZ. Gilbert, AZ: University of Arizona Cooperative Extension.
• Ottman, M. J. (2013, February). Irrigation of small grains. Arizona Cooperative Extension Field Crops Clinic, Avondale, AZ. Avondale: University of Arizona Cooperative Extension.
• Ottman, M. J. (2013, February). Irrigation of small grains. Arizona Cooperative Extension Field Crops Meeting, Coolidge, AZ. Coolidge, AZ: UA Coop Ext.
• Ottman, M. J. (2013, February). Small Grains Irrigation. Arizona Cooperative Extension Field Crops Meeting, Marana, AZ. Marana, AZ: UA Coop Ext.
• Ottman, M. J. (2013, July). Summer slump in alfalfa: Management implications for crop and pest management. Arizona Cooperative Extension "Tent Talks" Meeting, San Tan Valley, AZ. San Tan Valley, AZ: AZ Coop Ext.
• Ottman, M. J. (2013, June). Summer slump in alfalfa: Management implications for crop and pest management. Arizona Cooperative Extension "Tent Talks" Meeting, Goodyear, AZ. Goodyear, AZ: AZ Coop Ext.
• Ottman, M. J. (2013, March). Fertilizer recommendations for low desert wheat. Southwest Ag Summit, Yuma, AZ. Yuma, AZ: Yuma Fresh Vegetable Association.
• Ottman, M. J. (2013, November). Genetically modified crops: Agricultural policy considerations. League of Women Voters Seminar, Tucson. Tucson, AZ: League of Women Voters.
• Ottman, M. J. (2013, November). Growing practices for various types of wheat. Native Seeds/SEARCH Grain Workshop, Tempe, AZ. Tempe, AZ: Native Seeds/SEARCH.
• Ottman, M. J. (2013, October). Management of small grains in Arizona. Arizona Cooperative Extension Fall Field Crop Meeting, Marana, AZ. Marana, AZ: UA Coop Ext.
• Ottman, M. J. (2013, September). Irrigation practices and plant density for Arizona wheat production. Arizona Cooperative Extension Late Summer La Paz County Agronomic Workshop, Parker, AZ. Parker, AZ: UA Coop Ext.
• Ottman, M. J. (2013, September). Management of small grains in Arizona. Arizona Cooperative Extension Fall Field Crop Meeting, Coolidge, AZ. Coolidge, AZ: AZ Coop Ext.
• Ottman, M. J. (2012). Alfalfa Nutrient Requirements. Cooperative Extension Field Crops Meeting. Casa Grande, AZ.
• Ottman, M. J. (2012). Alfalfa Nutrient Requirements. Cooperative Extension Field Crops Meeting. Marana, AZ.
• Ottman, M. J. (2012). Crop Growth Stages of Wheat: What They Mean to You. Southwest Agricultural Summit. Yuma, AZ.
• Ottman, M. J. (2012). Crop Nutrient Requirements. New Mexico Crop Production Association Conference. Ruidioso, NM.
• Ottman, M. J. (2012). Fertilizer Effects on High Biomass Sorghum. Central Arizona Farmer Field Day. Maricopa, AZ.
• Ottman, M. J. (2012). Fertilizing Small Grains and Pest Management. Extension Field Crops Meeting. Avondale, AZ.
• Ottman, M. J. (2012). Fertilizing Small Grains and Pest Management. Extension Field Crops Meeting. Mesa, AZ.
• Ottman, M. J. (2012). Management of Aphids with Resistant Varieties in Alfalfa. Central Arizona Farmer Winter Field Day. Maricopa, AZ.
• Ottman, M. J. (2012). Nutrient Requirements for Alfalfa. Cooperative Extension Field Crops Meeting. Goodyear, AZ.
• Ottman, M. J. (2012). Wheat Irrigation Management. California Alfalfa and Grains Symposium. Sacramento, CA.
• Ottman, M. J. (2012). Wheat and Barley Varieties. Central Arizona Farmer Winter Field Day. Maricopa, AZ.
• Ottman, M. J. (2011). Alfalfa nutrient requirements, deficiency symptoms, and fertilizer application. Southwest Hay and Forage Conference. Ruidioso, NM: New Mexico Hay Association.
• Ottman, M. J. (2011). Irrigation cutoffs with alfalfa What are the implications. Western Alfalfa and Forage Conference. Las Vegas, NV: University of California Cooperative Extension.
• Ottman, M. J. (2011). Late season fertilizer recommendations for Arizona wheat producers. Southwest Agricultural Summit. Yuma, AZ: Yuma Fresh Vegetable Association, University of Arizona, and Yuma County Farm Bureau.
• Ottman, M. J. (2011). Managing fertilizer needs of alfalfa. Western Alfalfa and Forage Conference Agricultural Field Tour. Sandy Valley, NV: University of California Cooperative Extension.
• Ottman, M. J. (2011). Small grain fertilizer and irrigation requirements. Small Grain and Forage Meeting, Maricopa. Maricopa, AZ: University of Arizona Cooperative Extension.
• Ottman, M. J. (2011). Tissue testing as a guide for nitrogen fertilization application in forage sorghum. Sorghum Improvement Conference of North America. Stillwater, OK: Sorghum Improvement Committee.
• Ottman, M. J. (2011). Water requirements of perennial grasses for biofuel. Central Arizona Farmer Field Day. Maricopa, AZ: University of Arizona Cooperative Extension.
• Ottman, M. J. (2011). Water requirements of perennial grasses for biofuel. Small Grain and Forage Meeting, Marana. Marana, AZ: University of Arizona Cooperative Extension.

Poster Presentations

• Ottman, M. J., Norton, E. R., Mostafa, A. M., Andrade Sanchez, P., Grijalva, P., Diaz, D., & Evancho, B. E. (2020, October). Agronomic Assessment of Corn Silage Forage Production in Buckeye, and Casa Grande Arizona: Part of the Arizona Dairy Forage Initiative. Arizona Cooperative Extension 2020 Virtual Conference. Virtual: Arizona Cooperative Extension.
• Carter, A. Y., Thomas, R., Huskey, D., Curlango-Rivera, G., Root, R., Ottman, M. J., Hawes, M., & McLain, J. (2019, July 2019). Plant root border cell interactions with uranium and cadmium: Potential phytoremediation tool. Botany 2019. Tucson: Botanical Society of America.
• Mclain, J. E., Hawes, M. C., Ottman, M. J., Root, R. A., Curlango-Rivera, G., Huskey, D., Thomas, R., Carter, A., Mclain, J. E., Hawes, M. C., Ottman, M. J., Root, R. A., Curlango-Rivera, G., Huskey, D., Thomas, R., & Carter, A. (2019, July). Plant root border cell interactions with uranium and cadmium: a potential phytoremediation tool. Botany 2019: Sky Islands and Desert Seas Conference. Tucson, Arizona: Botanical Society of America, others.
• Norton, R., Ottman, M. J., Evancho, B. E., Mostafa, A. M., Andrade Sanchez, P., & Diaz, D. (2019, April). Arizona Extension Dairy Forage Initiative: Agronomic Assessment of Common Forage Commodities in the State of Arizona. 2019 ALVSCE Poster Forum. Tucson Arizona.
• Ottman, M. J., Norton, R., Evancho, B. E., Mostafa, A. M., Andrade Sanchez, P., Diaz, D., Ottman, M. J., Norton, R., Evancho, B. E., Mostafa, A. M., Andrade Sanchez, P., & Diaz, D. (2019, August). Evaluation of agronomic needs to improve our extension educational programs to dairy forage growers in the state.. 2019 Arizona Cooperative Extension Conference. Tucson Arizona: University of Arizona Cooperative Extension.
• Newcomb, M., White, J., Ward, R., Andrade-Sanchez, P., Heun, J. T., Ottman, M. J., Pumphrey, M., & Tuberosa, R. (2016, November). Rapid estimation of canopy cover in durum wheat using digital images. ASA, CSSA and SSSA International Annual Meetings. Phoenix: American Society of Agronomy.
• White, J., Ward, R., Andrade-Sanchez, P., Heun, J. T., Ottman, M. J., Pumphrey, M., & Tuberosa, R. (2016, November). Cadmium accumulation in spring wheat. ASA, CSSA and SSSA International Annual Meetings. Phoenix: American Society of Agronomy.
• Worku, B., Ottman, M. J., & Mostafa, A. (2016, November). Crop and soil response from phosphorus and potassium fertilizer rate. ASA, CSSA and SSSA International Annual Meetings. Phoenix: American Society of Agronomy.
• Worku, B., Ottman, M. J., & Mostafa, A. (2016, November). Phosphorus fertilizer source and rate effect on irrigated alfalfa in Arizona. ASA, CSSA and SSSA International Annual Meetings. Phoenix: American Society of Agronomy.
• Martre, P., Asseng, S., Ewert, F., Rotter, R., Lobell, D., Cammarano, D., Kimball, B., Ottman, M., Wall, G., White, J., Reynolds, M., Alderman, P., Prasad, V., Aggarwal, P., Anothai, J., Basso, B., Biernath, C., Challinor, A., De Sanctis, G., , Doltra, J., et al. (2015, March 16-18, 2015). Reducing uncertainty in prediction of wheat performance under climate change. 3rd Global Science Conference on Climate-Smart Agriculture. Le Corum, Montpellier, France: Agropolis International, CIRAD, INRA and IRD.
• Wall, G. W., Olivieri, L. M., Conley, M. M., West, K., Turner, J., Kimball, B. A., Ottman, M. J., White, J. W., & Dyer, J. M. (2015, November 13-14, 2015). Thermal regime agronomic cereal experiment (TRACE). Transitioning Cereal Systems to Adapt to Climate Change. Minneapolis, MN: Regional Approaches to Climate Change for Pacific Northwest Agriculture (NIFA Award #2011-68002-30191).

Reviews

• Ottman, M. J., & Hu, J. (2017. Understanding the Stripe Rust Disease(p. 2). https://agriculture.az.gov/sites/default/files/documents/2017%20Final%20Newsletter.pdf.
• Ottman, M. J., & Hu, J. (2017. Understanding the Stripe Rust Disease. https://agriculture.az.gov/sites/default/files/documents/2017%20Final%20Newsletter.pdf.

Creative Productions

• Ottman, M. J., & Hu, J. (2017. Understanding the Stripe Rust Disease. https://agriculture.az.gov/sites/default/files/documents/2017%20Final%20Newsletter.pdf: Arizona Department of Agriculture. https://agriculture.az.gov/sites/default/files/documents/2017%20Final%20Newsletter.pdf

Others

• Ottman, M. J. (2016, October). Growing grain sorghum in Arizona. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/5x0
  More info

  Revision of fact sheet originally published in 2009
• Ottman, M. J. (2016, October). Hay Fires: Causes, prevention, hazards, and control. Buckeye Valley Fire District Newsletter. http://uacals.org/5wz
• Ottman, M. J. (2016, October). Nondormant alfalfa varieties for Arizona, 2016. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/5wz
  More info

  Annual alfalfa variety summary
• Ottman, M. J. (2016, October). Wheat and barley varieties for Arizona, 2016. College of Agriculture and Life Sciences, University of Arizona, Tucson.. http://uacals.org/5wy
  More info

  Annual wheat and barley variety summary
• Ottman, M. J., Sheedy, M. D., & Ward, R. (2016, December). Can yield of late-planted small grains be compensated by water and nitrogen rates, 2016?. College of Agriculture and Life Sciences, University of Arizona, Tucson.. http://uacals.org/64c
• Ottman, M. J., Sheedy, M. D., & Ward, R. W. (2016, December). Clipping small grains to increase subsequent grain yield. College of Agriculture and Life Sciences, University of Arizona, Tucson.. http://uacals.org/64a
• Ottman, M. J., Sheedy, M. D., & Ward, R. W. (2016, December). Evaluation of Palisade as a growth regulator in durum, 2016. College of Agriculture and Life Sciences, University of Arizona, Tucson.. http://uacals.org/64e
• Ottman, M. J., Sheedy, M. D., & Ward, R. W. (2016, December). Late season N application method effect on grain protein, 2016. College of Agriculture and Life Sciences, University of Arizona, Tucson.. http://uacals.org/64d
• Ottman, M. J., Sheedy, M. D., & Ward, R. W. (2016, December). Small grains evaluation at Maricopa, 2016. College of Agriculture and Life Sciences, University of Arizona, Tucson.. http://uacals.org/64f
• Ottman, M. J., Sheedy, M. D., & Ward, R. W. (2016, December). Winter cereal forage evaluation at Maricopa, 2016. College of Agriculture and Life Sciences, University of Arizona, Tucson.. http://uacals.org/64b
• Husman, S. H., & Ottman, M. J. (2015, May). Growing alfalfa for seed in Arizona. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/394
• Husman, S. H., & Ottman, M. J. (2015, May). Irrigation of small grains in Arizona. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/3wp
• Knowles, T. C., & Ottman, M. J. (2015, May). Sudangrass Hay Production in the Irrigated Deserts of Arizona and California. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/3ws
• Ottman, M. J. (2015, February). Effect of planting date on wheat yield in Yuma, 2014. College of Agriculture and Life Sciences, University of Arizona, Tucson.. http://uacals.org/2y2
• Ottman, M. J. (2015, February). Small grains variety evaluation at Arizona City, Maricopa, and Yuma, 2014. College of Agriculture and Life Sciences, University of Arizona, Tucson.. http://uacals.org/2y1
• Ottman, M. J. (2015, Jan 1 - dec 31). Newsletter Articles (26). Maricopa and Pinal County Cooperative Extension.
  More info

  26 newsletter articles on various aspects of crop production
• Ottman, M. J. (2015, May). Cultural practices for Karnal bunt control. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/395
• Ottman, M. J. (2015, May). Planting dates for small grains in Arizona. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/39h
• Ottman, M. J. (2015, May). Planting methods for small grains in Arizona. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/39i
• Ottman, M. J. (2015, May). Seeding rates for small grains in Arizona. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/39j
• Ottman, M. J. (2015, May). Small grain growth and development. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/3wr
• Ottman, M. J. (2015, October). Wheat and barley varieties for Arizona, 2015. College of Agriculture and Life Sciences, University of Arizona, Tucson.. http://uacals.org/3n9
• Ottman, M. J. (2015, September). Nondormant alfalfa varieties for Arizona, 2015. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/3iu
• Ottman, M. J., & Thompson, T. L. (2015, May). Fertilizing small grains in Arizona. College of Agriculture and Life Sciences, University of Arizona, Tucson. http://uacals.org/3wq
• Ottman, M., Rovey, J., Mostafa, A., & Burayu, W. (2015, June). Phosphorus Fertilizer Rate Effect on Alfalfa Yield and Soil Test P, Buckeye, 2014. College of Agriculture and Life Sciences, University of Arizona, Tucson.. http://uacals.org/3eo
• Andrade Sanchez, P., & Ottman, M. J. (2011, May). . Determination of optimal planting configuration of low input and organic barley and wheat production in Arizona, 2013. College of Agriculture and Life Sciences, University of Arizona.
• Andrade Sanchez, P., & Ottman, M. J. (2014, June). Determination of optimal planting configuration of low input and organic barley and wheat production in Arizona 2013. University of Arizona Cooperative Extension. http://uacals.org/28r
  More info

  Publication no. AZ1630-2014
• Andrade Sanchez, P., & Ottman, M. J. (2014, June). Sensor-based management of nitrogen of irrigated durum wheat in Arizona 2013. University of Arizona Cooperative Extension. http://uacals.org/28q
  More info

  Publication no. AZ1629
• Andrade Sanchez, P., & Ottman, M. J. (2014, May). Determination of optimal planting configuration of low input and organic barley and wheat production in Arizona, 2013. College of Agriculture and Life Sciences, University of Arizona. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1630-2014.pdf
  More info

  Corresponding author: PAS
• Andrade Sanchez, P., & Ottman, M. J. (2014, May). Sensor‐based management of Nitrogen of irrigated durum wheat in Arizona, 2013. College of Agriculture and Life Sciences, University of Arizona. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1629-2014.pdf
  More info

  Corresponding author: PAS
• Loper, S. J., & Ottman, M. J. (2014, January). Renovating alfalfa stands in Arizona. University of Arizona Cooperative Extension. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1608.pdf
  More info

  Corresponding author: SJL
• Loper, S. J., Ottman, M. J., Norton, E. R., Loper, S. J., Ottman, M. J., & Norton, E. R. (2014, February). Renovating Alfalfa Stands in Arizona. University of Arizona Cooperative Extension. http://uacals.org/2la
  More info

  Publication no. AZ1608-2014
• Mostafa, A. M., & Ottman, M. J. (2014, Fall). Forage sorghum harvest. ACRES (Empire Caterpillar Magazine). http://www.empireag.com/uploadedFiles/AG/Resources/Fall%202014%20Final.pdf
  More info

  Corresponding author: AMM
• Ottman, M. J. (2014, Annual). Arizona Forage and Grain Crops Information. Univ. of Arizona Coop. Ext.. http://cals.arizona.edu/forageandgrain/
• Ottman, M. J. (2014, September). Non-dormant Alfalfa Varieties for Arizona 2014. University of Arizona Cooperative Extension. http://uacals.org/2mb
  More info

  Publication no. AZ1267
• Ottman, M. J. (2014, September). Nondormant alfalfa varieties for Arizona, 2014. University of Arizona Cooperative Extension. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1267-2014.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J., & Hought, J. M. (2014, February). Recommendations for growing standard-height wheat varieties in Arizona. University of Arizona Cooperative Extension. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1612.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J., & Mostafa, A. M. (2014, April). Summer slump in alfalfa. University of Arizona Cooperative Extension. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1611.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J., & Mostafa, A. M. (2014, Fall). Phosphorus fertilizer for alfalfa. ACRES (Empire Caterpillar Magazine). http://www.empireag.com/uploadedFiles/AG/Resources/Fall%202014%20Final.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J., Hought, J. M., Ottman, M. J., & Hought, J. M. (2014, January). Recommendations for Growing Standard-Height Wheat Varieties in Arizona. University of Arizona Cooperative Extension. http://uacals.org/29g
  More info

  Publication no. AZ1612
• Ottman, M. J., Mostafa, A. M., & Putnam, D. (2014, May). Summer slump in alfalfa. Progressive Forage Grower. http://www.progressiveforage.com/forage-types/alfalfa/summer-slump-in-alfalfa
  More info

  Corresponding author: MJO
• Ottman, M. J., Mostafa, A. M., & Putnam, D. H. (2014, May 1). Summer Slump in Alfalfa. Progressive Forage Grower. http://www.progressiveforage.com/forage-types/alfalfa/summer-slump-in-alfalfa
• Ottman, M. J., Ottman, M. J., Mostafa, A. M., & Mostafa, A. M. (2014, January). Summer Slump in Alfalfa. University of Arizona Cooperative Extension. http://uacals.org/2l4
  More info

  Publication no. AZ1611
• Loper, S. J., & Ottman, M. J. (2013, November). 2012 Sorghum silage variety trial at Maricopa. Forage and Grain, 2013, College of Agriculture and Life Sciences, University of Arizona, Tucson. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1597b.pdf
  More info

  Corresponding author: SJL
• Mostafa, A. M., & Ottman, M. J. (2013, October). Forage sorghum harvest. University of Arizona Cooperative Extension, Tucson. http://arizonaag.com/2013/09/11/forage-sorghum-harvest/
  More info

  Blog entry
• Ottman, M. J. (2013, December). Development of forage sorghum tissue testing for efficient fertilization, 2010. Forage and Grain, 2010. College of Agriculture and Life Sciences, University of Arizona, Tucson.. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1526j.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J. (2013, December). Effect of planting date on wheat yield in Yuma, 2013. Forage and Grain, 2013. College of Agriculture and Life Sciences, University of Arizona, Tucson.. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1597c.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J. (2013, December). Response of wheat and barley varieties to phosphorus fertilizer, 2010. Forage and Grain, 2010. College of Agriculture and Life Sciences, University of Arizona, Tucson.. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1526h.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J. (2013, December). Small grains evaluation at Maricopa, Coolidge, and Yuma, 2010. Forage and Grain, 2010. College of Agriculture and Life Sciences, University of Arizona, Tucson.. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1526i.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J. (2013, December). Small grains variety evaluation at Arizona City, Coolidge, Maricopa, and Yuma, 2013.. Forage and Grain, 2013. College of Agriculture and Life Sciences, University of Arizona, Tucson.. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1597d.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J. (2013, Jan - Dec). Arizona Forage and Grain Crops Information. University of Arizona Cooperative Extension, Tucson. http://cals.arizona.edu/forageandgrain/
• Ottman, M. J. (2013, Jan - Dec). Crop growth stage and water use calculator. University of Arizona Cooperative Extension, Tucson. http://cals.arizona.edu/forageandgrain/CropCalculators
• Ottman, M. J. (2013, Jan - May). Small grain advisory. University of Arizona Cooperative Extension, Tucson. http://ag.arizona.edu/forageandgrain/content/small-grains-2-february-2014
  More info

  Bi-weekly newsletter of small grain growth and water use.
• Ottman, M. J. (2013, October). Nondormant alfalfa varieties for Arizona, 2013. University of Arizona Cooperative Extension, Tucson. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1267.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J. (2013, October). Wheat and barley varieties for Arizona, 2013. University of Arizona Cooperative Extension, Tucson. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1265.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J., & Kimball, B. A. (2013, December). Invinsa application to reduce water stress effects on corn growth and yield at Maricopa. Forage and Grain, 2012. College of Agriculture and Life Sciences, University of Arizona, Tucson.. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1573-all.pdf
  More info

  Corresponding author: MJO
• Ottman, M. J., & Mostafa, A. (2013, August). Summer slump in alfalfa. University of Arizona Cooperative Extension, Tucson. http://arizonaag.com/2013/07/16/summer-slump-in-alfalfa/
  More info

  Blog entry
• Wang, G. (., Bronson, K., Thorp, K., & Ottman, M. (2013, December). Cultivar and nitrogen effects on yield and grain protein in irrgated durum wheat, 2012. Forage and Grain, 2013. College of Agriculture and Life Sciences, University of Arizona, Tucson.. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1597a.pdf
  More info

  Corresponding author: GW
• Mostafa, A., Wang, G., & Ottman, M. (2012, Fall). Soil sampling procedures for field crops. Univ. of Arizona Coop. Ext.. http://www.youtube.com/watch?v=QG3-ttTKDZQ
  More info

  Corresponding author: AM
• Mostafa, A., Wang, G., & Ottman, M. (2012, Fall). Tissue sampling in small grains for nitrate. Univ. of Arizona Coop. Ext.. http://www.youtube.com/watch?v=FBLcPQSk5bU
  More info

  Corresponding author: AM
• Mostafa, A., Wang, G., & Ottman, M. (2012, January). Growth stages of small grains. Univ. of Arizona Coop. Ext.. http://www.youtube.com/watch?v=mwCjxwMcyks
  More info

  Corresponding author: AM
• Ottman, M. (2012, Fall). Small grain advisory. University of Arizona Cooperative Extension.
• Ottman, M. (2012, Fall). Wheat and barley varieties for Arizona. University of Arizona Cooperative Extension. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1265-2012.pdf
  More info

  Corresponding author: MJO
• Wang, S., Loper, S., Nolte, K., & Ottman, M. (2012, Fall). Guidelines for using non-traditional soil additives. University of Arizona Cooperative Extension. https://extension.arizona.edu/sites/extension.arizona.edu/files/pubs/az1582.pdf
  More info

  Corresponding author: SW
• Guangyao, W., Loper, S. J., Ottman, M. J., & Walworth, J. L. (2011, September). Pre-plant Soil Testing for Small Grains. Arizona Cooperative Extension Bulletin..
• Loper, S., & Ottman, M. (2011, Fall). Fertilizing small grain. University of Arizona Cooperative Extension.
• Loper, S., & Ottman, M. (2011, Fall). Small grain irrigation. University of Arizona Cooperative Extension.
• Loper, S., & Ottman, M. (2011, Fall). Small grain planting dates and rates. University of Arizona Cooperative Extension.
• Ottman, M. (2011, Fall). Lodging control for wheat and barley in Arizona. University of Arizona Cooperative Extension.
• Ottman, M. (2011, Fall). Nondormant alfalfa varieties for Arizona. University of Arizona Cooperative Extension.
• Ottman, M. (2011, Fall). Wheat and barley varieties for Arizona. University of Arizona Cooperative Extension.
• Wang, G., Loper, S., Ottman, M., & Walworth, J. (2011, Fall). Preplant soil testing for small grains. University of Arizona Cooperative Extension.
• Ottman, M. (2010, Fall). Small grain advisory. University of Arizona Cooperative Extension.
• Ottman, M. J. (2010, Fall). Forage and Grain Crops Information. University of Arizona Cooperative Extension. http://cals.arizona.edu/forageandgrain
• Ottman, M. J. (2010, Fall). Forage and Grain Crops Web Site. University of Arizona Cooperative Extension. http://extension.arizona.edu/programs/forage-and-grain-crops