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Fertilizer and Irrigation Management Effects on Nitrous Oxide Emissions and Nitrate Leaching.
- Source :
- Agronomy Journal; Mar/Apr2014, Vol. 106 Issue 2, p703-714, 12p
- Publication Year :
- 2014
-
Abstract
- Irrigation and N fertilizer management are important factors affecting crop yield, N fertilizer recovery efficiency, and N losses as nitrous oxide (N<subscript>2</subscript>O) and nitrate (NO<subscript>3</subscript><superscript>-</superscript>). Split application of conventional urea (split-U) and/or one-time application of products designed to perform as enhanced-efficiency N fertilizers may mitigate N losses. The objective of this study was to compare the effects of controlled-release polymer-coated urea (PCU), stabilized urea with urease and nitrification inhibitors (IU) and split-U on direct soil- to-atmosphere emissions, NO<subscript>3</subscript><superscript>-</superscript> leaching, and yield for fully irrigated and minimum-irrigated corn in loamy sand. Indirect emissions due to NO<subscript>3</subscript> - leaching were estimated using published emission factors (EF5). Split-U increased yield and N uptake compared with preplant-applied PCU or IU and decreased NO<subscript>3</subscript><superscript>-</superscript> leaching compared with PCU. Direct emissions were significantly less with IU or split-U than with PCU, and there was a trend for greater emissions with split-U than with IU (P = 0.08). Irrigation significantly increased NO<subscript>3</subscript><superscript>-</superscript> leaching during the growing season but had no significant effect on direct emissions. After accounting for significantly increased yields with irrigation, however, N losses expressed on a yield basis did not differ and in some cases decreased with irrigation. Post-harvest soil N and soil-water NO<subscript>3</subscript><superscript>-</superscript> in spring showed the potential for greater N leaching in minimum-irrigated than fully irrigated plots. Indirect emissions due to NO<subscript>3</subscript><superscript>-</superscript> leaching were estimated to be 79 to 117% of direct emissions using the default value of EFy thus signifying the potential importance of indirect emissions in evaluating management effects on emissions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00021962
- Volume :
- 106
- Issue :
- 2
- Database :
- Complementary Index
- Journal :
- Agronomy Journal
- Publication Type :
- Academic Journal
- Accession number :
- 94901721
- Full Text :
- https://doi.org/10.2134/agronj2013.0179