{"id":1116,"date":"2019-03-05T09:00:41","date_gmt":"2019-03-05T17:00:41","guid":{"rendered":"https:\/\/blogs.cdfa.ca.gov\/FREP\/?p=1116"},"modified":"2019-03-05T12:12:24","modified_gmt":"2019-03-05T20:12:24","slug":"controlled-release-nitrogen-fertilizers","status":"publish","type":"post","link":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/controlled-release-nitrogen-fertilizers\/","title":{"rendered":"Research Update: Controlled Release Nitrogen Fertilizers"},"content":{"rendered":"

Project Title: <\/strong>Field Evaluation and Demonstration of Controlled Release Nitrogen Fertilizers in the Western United States
\nProject Leaders: <\/strong>Charles Sanchez, University of Arizona, and Richard Smith, University of California Cooperative Extension Monterey County
\nProject Status: <\/strong>Complete<\/p>\n

Overview: <\/strong>Controlled Release Nitrogen (CRN) has the potential to increase nitrogen use efficiency in desert vegetable production systems, by better matching nitrogen release with crop demand.<\/p>\n

Background: <\/strong>Controlled release nitrogen fertilizers are standard granular fertilizers encased in a polymer coating. The coating temporarily shields the nitrogen from interactions with the soil solution delaying its release. Release time depends on temperature, moisture, placement, and coating thickness. CRN is thought to be beneficial to growers due to its potential to increase nitrogen use efficiency and provide application flexibility.<\/p>\n

The success of CRN depends on how well the product\u2019s nitrogen (N) release rate matches crop N demand throughout the season. Releasing the N too slowly can deprive crops of the N required for growth and releasing the N too quickly can result in crop damage or N loss due to leaching, volatilization, or denitrification. The use of CRN should be customized to the production system and crop demand.<\/p>\n

Methods: <\/strong>Over the course of this project, from 2015 to 2018, several experimental demonstrations were conducted at University Research Centers and grower production sites in the Low Desert and Central Coast regions. These demonstrations compared standard grower practices with traditional soluble nitrogen sources, and various programs containing controlled release or enhanced efficiency fertilizers. The various trials where evaluated on iceberg and romaine lettuce, spinach, broccoli, cauliflower, cabbage, onions, artichokes, potatoes, sweet corn, peppers, tomatoes, and watermelons.<\/p>\n

Findings: <\/strong>The experimental demonstrations took place under a wide variety of crops, soil characteristics, and grower management practices. For detailed information on the individual demonstration projects and their results please see the final report: https:\/\/www.cdfa.ca.gov\/is\/ffldrs\/frep\/pdfs\/14-0508-SA_Sanchez.pdf<\/a><\/p>\n

In general, the probability of CRN exhibiting benefits increased in scenarios where irrigation methods were less efficient and where coarse textured soils were present. There was also a trend with increased benefits being exhibited for longer term crops such as broccoli. Overall, demonstrations showed that well managed CRN technologies can offer economically viable and environmentally sound N management practices for vegetable crop production.<\/p>\n

Impact: <\/strong>Over the span of this project, numerous evaluations provided a base understanding of CRN technologies in vegetable crop production. Additionally, the demonstration projects left an impact on grower cooperators and some of the growers have since adopted the use of CRN in their fertility programs.<\/p>\n

To increase grower adoption in the future, technical support from suppliers and researchers should help growers match products with their unique crop production systems to optimize the benefits of CRN technologies.<\/p>\n

Final Report: <\/strong>The final report for this project and a project factsheet are available: https:\/\/www.cdfa.ca.gov\/is\/ffldrs\/frep\/pdfs\/14-0508-SA_Sanchez.pdf<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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 …<\/p>\n

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These grants will fund four projects that will improve the efficiency and reduce the environmental\u2026","rel":"","context":"In "FREP Grant Program"","block_context":{"text":"FREP Grant Program","link":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/category\/frep-grant-program\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":72,"url":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/cdfa-accepting-concept-proposals-for-2016-fertilizer-research-and-education-grants\/","url_meta":{"origin":1116,"position":1},"title":"CDFA Accepting Concept Proposals for 2016 Fertilizer Research and Education Grants","author":"Brooke Elliot","date":"December 29, 2015","format":false,"excerpt":"The California Department of Food and Agriculture\u2019s Fertilizer Research and Education Program (FREP) is currently accepting concept proposals for the 2016 grant cycle. FREP\u2019s competitive grant program funds research that advances the agronomic and environmental performance of fertilizing materials. The 2016 Request for Proposals (RFP) includes several initiatives put forth\u2026","rel":"","context":"In "FREP Grant Program"","block_context":{"text":"FREP Grant Program","link":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/category\/frep-grant-program\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":260,"url":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/fertigation-short-course\/","url_meta":{"origin":1116,"position":2},"title":"Fertigation Short Course","author":"Brooke Elliot","date":"June 15, 2017","format":false,"excerpt":"What: A one-day short course on fertigation is being offered by the Cal Poly Irrigation Training and Research Center (ITRC) with funding from the Fertilizer Research and Education Program (FREP) of the California Department of Food and Agriculture. The course covers new techniques in the control and application of fertilizers\u2026","rel":"","context":"In "Nutrient Management Events"","block_context":{"text":"Nutrient Management Events","link":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/category\/nutrient-management-events\/"},"img":{"alt_text":"IRTC","src":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/FREP\/wp-content\/uploads\/2017\/06\/Irrigation-225x300.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":212,"url":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/events-for-march-2017\/","url_meta":{"origin":1116,"position":3},"title":"Events for March 2017","author":"Brooke Elliot","date":"February 27, 2017","format":false,"excerpt":"Efficient Irrigation and Nitrogen Use Workshop What: Hosted by the California Almond Sustainability Program, this workshop gives almond growers an opportunity to learn about tools and techniques to increase irrigation efficiency through Almond Board of California\u2019s (ABC\u2019s) Irrigation Continuum, and to improve the accuracy of nitrogen applications through the use\u2026","rel":"","context":"In "Nutrient Management Events"","block_context":{"text":"Nutrient Management Events","link":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/category\/nutrient-management-events\/"},"img":{"alt_text":"","src":"","width":0,"height":0},"classes":[]},{"id":389,"url":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/fertigation-short-course-2\/","url_meta":{"origin":1116,"position":4},"title":"Fertigation Short Course","author":"Brooke Elliot","date":"February 6, 2018","format":false,"excerpt":"What: A one-day short course on fertigation is being offered by the Cal Poly Irrigation Training and Research Center (ITRC) with funding from the Fertilizer Research and Education Program (FREP). 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