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Research Update: Train the Trainer
Research Project: Train the Trainer: A Nitrogen Management Training Program for Growers. Klassen, P. et al. Status: Second year of a three year study Issue: Growers who belong to California’s Central Valley Water Quality Coalitions and who are in designated high vulnerability areas are under new Irrigated Lands Regulatory Program (ILRP) requirements to keep “on farm” a certified Nitrogen Management …
Research Update: Improving N Use Efficiency of Cool Season Vegetables with Broccoli Rotations
Research Project: Improving N Use Efficiency of Cool Season Vegetable Production Systems with Broccoli Rotations. Smith R. et al. Status: Completed Issue: The cool season vegetable production areas of the California’s Central Coast frequently grow two or three crops during the growing season. The dominant crops—like lettuce and spinach—require high rates of N to produce the yield and quality demanded …
Research Update: Data Driven Nitrate Leaching Hazard Index and BMP Assessment Tool
Research Project: A Data Driven Nitrate Leaching Hazard Index and BMP Assessment Tool – O’Geen, A. et al. Status: Second year of a three year study Issue: California growers are faced with the challenge of producing high-quality crops while minimizing the movement of fertilizer nitrogen to groundwater. One major difficulty is identifying the growing areas that have a high risk …
Research Update: Fertilizer Value of Nitrogen in Irrigation Water
Research Project: Determining the Fertilizer Value of Ambient Nitrogen in Irrigation Water – Cahn, M. et al. Status: Final year of study Issue: Irrigation water from many wells on the Central Coast contains a significant amount of nitrate-nitrogen (NO3-N). The N content in irrigation water has not been accounted for in growers’ nitrogen fertilization plans because it is unclear how …
Research Update: N Fertilizer Requirements of Crops Following Alfalfa
Research Project: Characterizing N Fertilizer Requirements of Crops Following Alfalfa – Putnam, D. et al. Issue: Alfalfa is a leguminous crop that converts atmospheric nitrogen (N) into organic compounds. While it is well-known that crops following alfalfa benefit from the residual N produced by alfalfa, the amount of residual N has rarely been measured. Previous estimates of N carryover from …