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1. Improving Nutrient Use Efficiency in Irrigated Areas of Western AgricultureMuch of Western US crop production requires irrigation for optimum performance. Irrigated cropping systems often include high-value crops grown with intensive nutrient management. Irrigation management is integral with nutrient management, especially for nitrogen. The predominant form of plant-available nitrogen in soils is nitrate, which is highly mobile and greatly affected by irrigation management. Irrigation, therefore, adds complexity to already intensive management and introduces challenges... A. Blaylock |
2. Nitrogen Management and Water Productivity of Grain Crops Under Drought or Limited IrrigationThe interactions of nitrogen management and water have been the subject of many studies that have improved crop management practices. Water scarcity however, has become a pressing contemporary challenge for agricultural and food sustainability, especially in many arid and semi-arid regions of the world. As the amount of available water for irrigation decreases, more studies must shift their focus to how nitrogen fertilizers influences water use efficiency. Numerous strategies are currently employed... S. Evans, N. Hansen, A. Blaylock |
3. Understanding Crop Response to MicronutrientsThere are many factors that affect crop response to micronutrients, and response to micronutrients is often less predictable than response to N, P, and K. Responses to micronutrients may be dramatic if the nutrient is deficient, but more often, responses are incremental yield increases or even only maturity or quality improvements. Micronutrient chemistry in the soil is complex and there are numerous interactions with other nutrients and environmental conditions. While predictability of micronutrient... A. Blaylock |
4. Exploring Controlled Release Nitrogen Fertilizers for Vegetable and Melon Crop Production in California and ArizonaVarious forms of polymer coated urea (PCU) were examined as sources of controlled release nitrogen for production of cauliflower, watermelon, carrot, and spinach in Arizona or California. Studies were designed to demonstrate the effectiveness of PCU for supplying 100 percent of the fertilizer nitrogen needed for an entire growing season in a single pre-plant application. In each study, two or more N rates were tested. PCU having an appropriate release time for a given set of growing conditions... R. Smith, A. Blaylock, E. Ellison, C. Sanchez |
5. The Ammonia RainbowAgriculture has been identified as a major contributor to atmospheric carbon dioxide with nitrogen fertilizer production as a key component. Recent scrutiny of nitrogen production processes has identified ammonia production processes to reduce carbon output from traditional Haber-Bosch processes. These different ammonia production processes are often described with color descriptions to designate the processes used and qualitatively identify their carbon footprint, such as “green ammonia”,... A. Blaylock |