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United States Department of Agriculture

Agricultural Research Service

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Research Project: Nitrogen Source Effects on Nitrous Oxide Emissions from Irrigated and Rainfed Production Systems

Location: Northwest Sustainable Agroecosystems Research

Project Number: 5348-11000-006-01-T
Project Type: Trust Fund Cooperative Agreement

Start Date: May 1, 2008
End Date: Apr 30, 2013

The fertilizer industry and the USDA-Agricultural Research Service's (USDA-ARS) GRACEnet project need scientifically sound N2O emissions data from field research plots treated with various N sources across the U.S. The USDA-ARS GRACEnet cross location project has (1) a research network in place; (2) established cross location protocols for greenhouse gas sampling; (3) the facilities and personnel; and (4) the initial instrumentation required to expand its collection of this type of data. GRACEnet objective 2 includes the collection of CO2, N2O and CH4 greenhouse gas data, in addition to soil carbon sequestration. This research project will evaluate the effects of controlled release and stabilized nitrogen sources on nitrous oxide emissions in rainfed and irrigated cropping systems at several ARS research locations compared with the commonly used urea and urea-ammonium nitrate fertilizer sources.

Nitrogen source studies will be conducted at five ARS locations (Fort Collins, Colorado; Ames, Iowa; St. Paul, Minnesota; Pullman, Washington; and Auburn, Alabama) to collect greenhouse gas emissions data from corn, cotton, wheat, and potato cropping systems (varies with location). Several N fertilizer sources (a controlled release polymer-coated urea (ESN); a stabilized urea source, SuperU or UAN treated with AgrotainPlus; UAN and/or Urea as conventional sources) will be applied as a minimum to a cropping system at each location. Except for the irrigated Fort Collins site and one irrigated site at St. Paul, all sites are rainfed cropping systems, with either conventional tillage or no-tillage management practices, or both. Nitrogen rates at each location will include at least a near optimal N rate (for greenhouse gas data collection) for the crop and cropping system. The N sources will be applied using normal farming practices at each location. Nitrous oxide emissions (and possibly CO2 and CH4 emissions) from each N source treatment and a check (zero fertilizer N applied) treatment will be monitored several times each week during the growing season. Methods used for greenhouse gas measurements will follow those established for the ARS GRACEnet program. Crop yield data, needed soil water and temperature data, and other necessary data needed to interpret the greenhouse gas emissions results will be collected. A scientifically sound experimental design with a minimum of 3 replications will be used at each location. 5402-11000-008-00L: GRACEnet: An Assessment of Soil Carbon Sequestration and Greenhouse Gas Mitigation by Agricultural Management Cross Location Participants listed under 5402-11000-008-00L/411610: 3625-11000-004-00D/409178: Trace Gas Exchanges in Midwest Cropping Systems National Soil Tilth Research Laboratory (Ames, Iowa) 3640-12000-007-00D/410684: Farming Practices for the Northern Corn Belt to Protect Soil Resources, Support Biofuel Production and Reduce Global Warming Potential Soil and Water Management Research (St. Paul, Minnesota) 5348-11000-005-00D/414427: Quantifying and Predicting Emission of PM10 and Greenhouse Gases from Agricultural Soils Land Management and Water Conservation Research (Pullman, Washington) 5402-12130-008-00D/410759: Improving Soil and Nutrient Management Systems for Sustained Productivity and Environmental Quality Soil, Plant, Nutrient Research (Fort Collins, Colorado) 6420-12610-003-00D/410823: Conservation Systems Research for Improving Environmental Quality and Producer Profitability Soil Dynamics Research (Auburn, Alabama)

Last Modified: 10/16/2017
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