Inspection Services Blog

Category Archives: All


Registration Now Open for 28TH Annual FREP/WPHA Nutrient Management Conference

The California Department of Food and Agriculture (CDFA) Fertilizer Research and Education Program (FREP) and the Western Plant Health Association (WPHA) announce registration is now open for their 28th annual nutrient management conference October 28-29. This year’s conference will be an online webinar. The conference brings together industry professionals and academic researchers to learn about and share the latest research …


Research Update: Evaluation of Biochar

Note: This is part of a Research Update series that highlights projects funded by the Fertilizer Research and Education Program (FREP) annual grant program. Project Title: Evaluation of Biochar for On-Farm Soil Management in California Project Leaders: Danielle Gelardi, Sanjai J. Parikh, William R. Horwath, Daniel Geissler, Toby O’Geen, Kate M. Scow (UC Davis), Milt McGiffen (UC Riverside), Michelle Leinfelder-Miles (UC …


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 and nutrients to crops. Chemigation …


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 practice can lead to over-application …


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, in vegetable crop production systems. …


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 Status: Year 3 of 3 …


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 better matching nitrogen release with …


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 (N) removal coefficients and nitrogen …


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 and nitrogen management. The East …


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 farm management practices that can …