2008 Joint Annual Meeting (5-9 Oct. 2008): Nitrogen Source Effects On Nitrous Oxide Emissions From An Irrigated No-Till Corn Field (GRACEnet).
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682-1 Nitrogen Source Effects On Nitrous Oxide Emissions From An Irrigated No-Till Corn Field (GRACEnet).



Tuesday, 7 October 2008
George R. Brown Convention Center, Exhibit Hall E
Ardell D. Halvorson1, Stephen Del Grosso1, Curtis Reule1 and Francesco Alluvione2, (1)USDA-ARS, 2150 Centre Ave, Bldg D, Ste 100, Ft. Collins, CO 80526
(2)Dept. of Agronomy, Forest, and Land Management, University of Turin (Italy), via L. da Vinci 44, 10095, Grugliasco (TO), Italy
The effect of several N sources on nitrous oxide (N<sub>2</sub>O) emissions from an irrigated, no-till (NT) continuous corn field was investigated.  Emissions were monitored in plots receiving 246 kg N/ha during the 2007 growing season and 202 kg N/ha during the 2008 growing season.  Nitrogen sources included dry granular urea, liquid urea-ammonium nitrate (UAN), two polymer-coated urea (PCU) sources, and urea and UAN treated with nitrification and urease inhibitors.  The N was surface band applied in the corn row at emergence with 1.3 cm of irrigation water applied within 3 days of N application.  Plot size was 2.7 x 4.6 m for each N source, with 3 replications in a randomized complete block design.   N<sub>2</sub>O fluxes were measured during the growing season at two locations within each plot using static, vented chambers, one to three times per week, and a gas chromatograph analyzer.  In 2007, N<sub>2</sub>O emissions were not significantly different between urea and UAN.   The PCU fertilizers and urea and UAN fertilizers treated with nitrification and urease inhibitors showed significantly lower N<sub>2</sub>O emissions than dry granular urea in 2007.  Only the urea and UAN sources treated with the nitrification inhibitors had significantly lower N<sub>2</sub>O emissions than UAN in 2007.  Based on the 2007 results, these N sources need further evaluation to determine their effectiveness in reducing N<sub>2</sub>O emissions in irrigated cropping systems.  The study was continued in 2008.
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