Nitrogen Management Affects Nitrous Oxide Emissions under Varying Cotton Irrigation Systems in the Desert Southwest, USA
| Autor: | D. J. Hunsaker, Kelly R. Thorp, Rodney T. Venterea, Stephen J. Del Grosso, Clinton F. Williams, Sharette M. Rockholt, Kevin F. Bronson, Edward M. Barnes |
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| Rok vydání: | 2018 |
| Předmět: |
Crops
Agricultural 0106 biological sciences Irrigation Agricultural Irrigation Environmental Engineering Nitrogen Ammonium nitrate Nitrous Oxide chemistry.chemical_element Drip irrigation 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences Soil chemistry.chemical_compound Nitrate Southwestern United States Fertilizers Waste Management and Disposal Surface irrigation 0105 earth and related environmental sciences Water Science and Technology Gossypium 04 agricultural and veterinary sciences Nitrous oxide Pollution Agronomy chemistry Loam 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Desert Climate 010606 plant biology & botany |
| Zdroj: | Journal of Environmental Quality. 47:70-78 |
| ISSN: | 0047-2425 |
| DOI: | 10.2134/jeq2017.10.0389 |
| Popis: | Irrigation of food and fiber crops worldwide continues to increase. Nitrogen (N) from fertilizers is a major source of the potent greenhouse gas nitrous oxide (NO) in irrigated cropping systems. Nitrous oxide emissions data are scarce for crops in the arid western United States. The objective of these studies was to assess the effect of N fertilizer management on NO emissions from furrow-irrigated, overhead sprinkler-irrigated, and subsurface drip-irrigated cotton ( L.) in Maricopa, AZ, on Trix and Casa Grande sandy clay loam soils. Soil test- and canopy-reflectance-based N fertilizer management were compared. In the furrow- and overhead sprinkler-irrigated fields, we also tested the enhanced efficiency N fertilizer additive Agrotain Plus as a NO mitigation tool. Nitrogen fertilizer rates as liquid urea ammonium nitrate ranged from 0 to 233 kg N ha. Two applications of N fertilizer were made with furrow irrigation, three applications under overhead sprinkler irrigation, and 24 fertigations with subsurface drip irrigation. Emissions were measured weekly from May through August with 1-L vented chambers. NO emissions were not agronomically significant, but increased as much as 16-fold following N fertilizer addition compared to zero-N controls. Emission factors ranged from 0.10 to 0.54% of added N fertilizer emitted as NO-N with furrow irrigation, 0.15 to 1.1% with overhead sprinkler irrigation, and |
| Databáze: | OpenAIRE |
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