358-14
Evaluating N Source and Placement Strategies To Manage N2O Emissions In No-Till Corn.

Poster Number 1223

Wednesday, November 6, 2013
Tampa Convention Center, East Hall, Third Floor

Leonardo M. Bastos, Agronomy, Kansas State University, Manhattan, KS and Charles W. Rice, Department of Agronomy, Kansas State University, Manhattan, KS
Global N fertilizer use in agriculture is projected to increase to match the increasing demand for food.  Agricultural lands that receive N fertilizer are considered the main source of anthropogenic N2O and account for 68% of total N2O emissions in the US. Strategies that attempt to better match nutrient availability and plant needs, such as N fertilizer source and placement, and the use of enhanced-efficiency fertilizers, are recognized as practices to avoid N losses and increase crop N use efficiency (NUE), but quantification of N2O emissions is needed from these recommended practices. The objective of this study was to evaluate N strategies for N2O emissions. To test for that, treatments consisted of a combination between N source and placement: urea broadcast, UAN broadcast, coated urea broadcast, UAN surface-band, UAN subsurface-band, UAN + nitrification inhibitor subsurface-band and a 0 N control. The N2O emissions were monitored using a steady-state vented chamber, once per week before the fertilizer has been applied, two to three times per week when rainfall events occurred, and once a week otherwise. To date, UAN subsurface-band emitted the most (3.1 kg N-N2O ha-1), whereas the control (0.23 kg N-N2O ha-1), UAN broadcasted (0.52 kg N-N2O ha-1), UAN subsurface-banded + nitrification inhibitor (1.06 kg N-N2O ha-1) and coated-urea broadcasted (1.1 kg N-N2O ha-1) emitted the least. The use of nitrification inhibitor decreased N2O emissions by 66%, when compared to the fertilizer alone.
See more from this Division: ASA Section: Environmental Quality
See more from this Session: Greenhouse Gas Emission Methodology and Analyses

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