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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Nitrate Quick Test

The nitrate quick test (NQT) is a cost-effective tool that can be used in nutrient management planning to determine the residual soil nitrate concentration. The results from the test can be used to improve fertilizer management and assist growers in accurately meeting crop needs. Here is an outline of the steps for preparing soil samples, […]

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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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Vacancies on FREP’s Technical Advisory Subcommittee

The California Department of Food and Agriculture is announcing three vacancies on the Fertilizer Research and Education Program’s (FREP) Technical Advisory Subcommittee (TASC). The TASC reviews and recommends research and education proposals for funding and implementation to the department’s Fertilizer Inspection Advisory Board. Applicants must demonstrate technical, applied, and scientific expertise in the fields of […]

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Role of Mineralization in Farming

California growers have taken on an important role in their state’s broader efforts on climate change, including responding to regulatory requirements to improve their nitrogen (N) use efficiency and reduce their environmental impact. To meet these regulations, while maintaining crop yield and quality, growers must consider all potential N sources, including organic amendments and irrigation […]

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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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