Updated Fertigation Book

In California agriculture, there has been a gradual shift from gravity-fed irrigation to pressurized systems including micro-irrigation. Micro-irrigation systems have been implemented in over 60% of irrigated acreage in California and support a more intensively managed production system. The use of pressurized irrigation systems has made significant advancements possible, including more precise delivery of chemicals […]

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Developing Nutrient Budget in Citrus Groves

Research Update: Developing Nutrient Budget and Early Spring Nutrient Prediction Model for Nutrient Management in Citrus Project leaders: Patrick Brown and Douglas Amaral Project location: Fresno, Tulare and Ventura Counties Year of study: 2 of 3 Overview: Leaf analysis with critical value* interpretation is a common practice for determining nutrient applications in citrus. However, this […]

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Research Update: Examining the Capabilities of Biochar to Adsorb Ammonium

Project Title: Soil Biochar Amendment to Improve Nitrogen and Water Management Project Leader: Suduan Gao, Research Soil Scientist, USDA-ARS Project Location: San Joaquin Valley Year of Study: Two of three Overview: The goal of this study is to determine the overall benefits and best practices associated with the use of biochar, as a soil amendment, […]

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Demonstrating New Approaches to Almond Nitrogen Management

Project Title: Demonstration of a combined new leaf sampling technique for nitrogen analysis and nitrogen applications approach in almonds Project Leaders: Patrick Brown, University of California, Davis; Blake Sanden, University of California Cooperative Extension, Kern County; Allan Fulton, University of California Cooperative Extension, Tehama County; David Doll, University of California Cooperative Extension, Merced County. Project […]

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Research Update: Controlled Release Nitrogen Fertilizers

Project Title: Field Evaluation and Demonstration of Controlled Release Nitrogen Fertilizers in the Western United States Project Leaders: Charles Sanchez, University of Arizona, and Richard Smith, University of California Cooperative Extension Monterey County Project Status: Complete Overview: Controlled Release Nitrogen (CRN) has the potential to increase nitrogen use efficiency in desert vegetable production systems, by […]

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Research Update: Nitrogen Concentrations in Harvested Material

Project Leaders: Charlotte Gallock, Kings River Conservation District, John Dickey, Southern San Joaquin Valley Management Practices Evaluation Program (MPEP), and Ken Cassman, Senior Agronomic and Soils Advisor Project Status: Year One Overview: The goal of this project is to assist Central Valley growers and coalitions with nutrient management planning and performance assessment by updating nitrogen […]

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Research Update: Irrigation Training to Optimize Irrigation Efficiency and Minimize Nutrient Loss

Project Leaders: Trina Walley, Program Coordinator with East Stanislaus Resource Conservation District and Khaled Bali, Irrigation Water Management Specialist for University of California Kearney Agriculture Research and Extension Center Project Status: Year One Project Location: Stanislaus County Overview With growing advancements in technology, there is a high demand for individuals with technical training in irrigation […]

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Research Update: Implementing Practices to Reduce Nitrous Oxide Emissions from Agricultural Soils

Project Title: N2O emissions under different on-farm irrigation and nutrient management BMPs that reduce groundwater nitrate loading and applied water Project Leader: Arlene Haffa, School of Natural Sciences, California State University, Monterey Bay Location: Central Coast Focus Crops: Strawberry, Lettuce, Broccoli Overview: The primary goal of this project is to develop a better understanding of […]

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Research Update: Nitrogen management of organic leafy green vegetables on the Central Coast

Project Title: “Evaluation and demonstration of nitrogen management of organic vegetable production in leafy green vegetables on the Central Coast” Project Leaders: Richard Smith, Michael Cahn, and Tim Hartz Location: California Central Coast Overview: This project aims to evaluate the proportion of crop nitrogen (N) that is provided by soil organic matter mineralization in organic leafy vegetable production under […]

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Research Update: A Decision Support Tool for Processing Tomato Irrigation and Fertilization

Project Title: “Developing a decision support tool for processing tomato irrigation and fertilization in the Central Valley based on CropManage” Project Leader: Daniel Geisseler Location: Statewide Overview: This project aims to develop web-based decision support for improved N and irrigation management of processing tomatoes on the CropManage web tool. Issue: California growers are facing increasing pressure to improve nitrogen (N) […]

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