{"id":1082,"date":"2019-01-15T10:02:15","date_gmt":"2019-01-15T18:02:15","guid":{"rendered":"https:\/\/blogs.cdfa.ca.gov\/FREP\/?p=1082"},"modified":"2019-03-05T11:47:32","modified_gmt":"2019-03-05T19:47:32","slug":"nitrogen-removed","status":"publish","type":"post","link":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/nitrogen-removed\/","title":{"rendered":"Research Update: Nitrogen Concentrations in Harvested Material"},"content":{"rendered":"\n

Project Leaders:<\/strong> 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 <\/p>\n\n\n\n

Project Status:<\/strong> Year One <\/p>\n\n\n\n

Overview:<\/strong> 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 sequestration rates for 25 California crops. <\/p>\n\n\n\n

Background:<\/strong> The Central Valley Regional Water Quality Control Board, through the Irrigated Lands Regulatory Program (ILRP), requires growers to report the amount of nitrogen applied and removed from their fields. Applied nitrogen that is not removed from fields through harvest can be incorporated into perennial tissues, remain in the field as available N for future fertilization, or potentially leach to groundwater. For growers to make informed decisions on maximizing the efficiency of nitrogen applications, more data is needed on the N concentrations of harvested plant materials and the amount of N stored in woody tissues.<\/p>\n\n\n\n

In 2016, Dr. Daniel Geisseler published a report summarizing N concentrations for 72 crops, based on current available literature. Geisseler\u2019s report acknowledges that many of the available conversion factors are based on older data that may have been determined based on farming systems outside of California, which may not reflect current Central Valley agriculture. (https:\/\/apps1.cdfa.ca.gov\/FertilizerResearch\/docs\/Geisseler_Report_2016_12_02.pdf<\/a>)
Additional information is needed to help growers and coalitions accurately report and plan nitrogen application and removal. <\/p>\n\n\n\n

Objectives:<\/strong> This project will assess the nitrogen concentration in harvested materials removed from fields (N removed) for approximately 25 crops. Harvest samples will be collected and analyzed for eleven of those crops (carrots, grain and silage corn, peaches, pima cotton, pistachio, plums, pomegranates, raisins, safflower, grain and silage sorghum, and processing tomatoes) and data for the remaining crops will be pulled from existing sources and projects.<\/p>\n\n\n\n

\"Drawings
These crops will be sampled at harvest.<\/figcaption><\/figure>\n\n\n\n

This project will also establish values for the annual amount of nitrogen stored in standing biomass for seven perennial crops. This information will be based off tissue samples collected and analyzed, as well as crop data from current literature and research. <\/p>\n\n\n\n

Reaching Growers:<\/strong> Once collected and analyzed, the new data will be published as an update to Dr. Geisseler\u2019s report \u201cNitrogen Concentration in Harvested Plant Parts \u2013 A Literature Overview.\u201d The data will also be used to update existing support tools for growers, including MPEP\u2019s \u201cCrop Yield to Nitrogen Removed Calculator\u201d (http:\/\/agmpep.com\/calc-y2r\/<\/a>). <\/p>\n\n\n\n

Other resources available to growers include:
\u2022 Nutrient Removal Calculator through the International Plant Nutrition Institute (IPNI) (https:\/\/www.ipni.net\/app\/calculator\/home<\/a>)
\u2022 Nutrient Content of Crops Tool through USDA Natural Resources Conservation Service (NRCS) (https:\/\/plants.usda.gov\/npk\/main<\/a>) <\/p>\n\n\n\n

For more information or questions about FREP-funded projects, please contact us at FREP@cdfa.ca.gov. You can also subscribe to the FREP blog for updates on this project and other projects.<\/p>\n","protected":false},"excerpt":{"rendered":"

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 …<\/p>\n

Read More<\/a><\/div>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[86],"tags":[],"class_list":["post-1082","post","type-post","status-publish","format-standard","hentry","category-all"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p9r16A-hs","jetpack-related-posts":[{"id":228,"url":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/research-update-train-the-trainer\/","url_meta":{"origin":1082,"position":0},"title":"Research Update: Train the Trainer","author":"Brooke Elliot","date":"August 15, 2017","format":false,"excerpt":"Research Project: Train the Trainer: A Nitrogen Management Training Program for Growers. Klassen, P. et al. Status: Second year of a three year study Issue: Growers who belong to California\u2019s Central Valley Water Quality Coalitions and who are in designated high vulnerability areas are under new Irrigated Lands Regulatory Program\u2026","rel":"","context":"In "All"","block_context":{"text":"All","link":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/category\/all\/"},"img":{"alt_text":"Larry Schwankl, UCCE Irrigation Specialist, presenting to CCAs at a Train the Trainer course in November 2015.","src":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/FREP\/wp-content\/uploads\/2017\/05\/LS-trains-trainers-300x225.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":334,"url":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/grants-to-begin-funding-january-2018\/","url_meta":{"origin":1082,"position":1},"title":"Grants to Begin Funding January 2018","author":"Brooke Elliot","date":"January 2, 2018","format":false,"excerpt":"The Fertilizer Research and Education Program (FREP) of the California Department of Food and Agriculture (CDFA) is pleased to announce the award of almost $800,000 in grant funds to agricultural organizations and universities this year. 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":307,"url":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/grower-training-sessions-to-certify-nitrogen-management-plans\/","url_meta":{"origin":1082,"position":2},"title":"Grower Training Sessions to Certify Nitrogen Management Plans","author":"Brooke Elliot","date":"December 26, 2017","format":false,"excerpt":"Regulations adopted by the Central Valley Regional Water Board require growers to prepare an annual Nitrogen Management Plan (NMP) for land enrolled in the Irrigated Lands Regulatory Program. If a growers\u2019 fields are located in high vulnerability areas, their NMPs must be certified. Certified Crop Advisers with Nitrogen Management Training\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":"Taking the grower training test","src":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/FREP\/wp-content\/uploads\/2017\/12\/Grower-training-300x234.jpg?resize=350%2C200","width":350,"height":200},"classes":[]},{"id":392,"url":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/nitrogen-management-training-for-certified-crop-advisers\/","url_meta":{"origin":1082,"position":3},"title":"Nitrogen Management Training for Certified Crop Advisers","author":"Brooke Elliot","date":"February 16, 2018","format":false,"excerpt":"What: The University of California Agriculture and Natural Resources (UCANR) and the Fertilizer Research and Education Program (FREP) of CDFA are offering a one-and-a-half day Nitrogen Management Training to California Certified Crop Advisers (CCAs). Why: CCAs play an essential role in helping farmers comply with California\u2019s developing environmental regulations through\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":212,"url":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/events-for-march-2017\/","url_meta":{"origin":1082,"position":4},"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":2775,"url":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/observations-from-the-field-central-coast-growers-adopt-winter-cover-crops-to-improve-nitrogen-use-efficiency-and-facilitate-regulatory-compliance\/","url_meta":{"origin":1082,"position":5},"title":"Observations from the Field: Central Coast Growers Adopt Winter Cover Crops to Improve Nitrogen Use Efficiency and Facilitate Regulatory Compliance","author":"Karen Adler","date":"April 27, 2026","format":false,"excerpt":"Note: This is part of a Research and Outreach Update series that highlights projects funded by the California Department of Food and Agriculture\u2019s (CDFA)\u00a0Fertilizer Research and Education Program (FREP) annual grant program. Project Title: Facilitating Grower Adoption of Cover Crop Nitrogen Scavenging to Minimize Residual Nitrogen Loss and Comply with\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":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/FREP\/wp-content\/uploads\/2026\/04\/PIs-and-Karen-150x118.jpg?resize=350%2C200&ssl=1","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/FREP\/wp-content\/uploads\/2026\/04\/PIs-and-Karen-150x118.jpg?resize=350%2C200&ssl=1 1x, https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/FREP\/wp-content\/uploads\/2026\/04\/PIs-and-Karen-150x118.jpg?resize=525%2C300&ssl=1 1.5x, https:\/\/i0.wp.com\/blogs.cdfa.ca.gov\/FREP\/wp-content\/uploads\/2026\/04\/PIs-and-Karen-150x118.jpg?resize=700%2C400&ssl=1 2x"},"classes":[]}],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/wp-json\/wp\/v2\/posts\/1082","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/wp-json\/wp\/v2\/comments?post=1082"}],"version-history":[{"count":4,"href":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/wp-json\/wp\/v2\/posts\/1082\/revisions"}],"predecessor-version":[{"id":1088,"href":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/wp-json\/wp\/v2\/posts\/1082\/revisions\/1088"}],"wp:attachment":[{"href":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/wp-json\/wp\/v2\/media?parent=1082"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/wp-json\/wp\/v2\/categories?post=1082"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.cdfa.ca.gov\/FREP\/index.php\/wp-json\/wp\/v2\/tags?post=1082"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}