This report analyzes nitrogen use trends in California's Central Valley and Central Coast. Using self-reported data from the Irrigated Lands Regulatory Program (ILRP), we show trends in nitrogen applications and efficiency practices across crop types, years (2018-2023), and geography.
Contributors: Divya Prakash, Erik Porse, Rachel Shellabarger, Mehdi Nemati, and Ariel Dinar.
Citation: Divya Prakash, Erik Porse, Rachel Shellabarger, Mehdi Nemati, and Ariel Dinar. (2025). Patterns of Nitrogen Management Practices and Use Efficiency in California's Central Valley and Central Coast. California Institute for Water Resources. December 2025.