Impact of nitrogen management and tillage practices on nitrous oxide emissions from rainfed corn

被引:8
作者
Arango, Miguel A. [1 ]
Rice, Charles W. [2 ]
机构
[1] AGROSAVIA, Colombian Corp Agr Res, Km 17 Via Puerto Lopez, Villavicencio, Meta, Colombia
[2] Kansas State Univ, Dep Agron, 2004 Throckmorton Hall, Manhattan, KS 66506 USA
基金
美国国家科学基金会;
关键词
SOYBEAN-ALFALFA ROTATIONS; N2O EMISSIONS; NO-TILL; FERTILIZER MANAGEMENT; TROPICAL SOILS; CARBON-DIOXIDE; ZERO-TILL; DENITRIFICATION; FLUXES; NITRIFICATION;
D O I
10.1002/saj2.20285
中图分类号
S15 [土壤学];
学科分类号
0903 ; 090301 ;
摘要
More than 85% of anthropogenic N2O emissions are associated with N enrichment of agricultural soils. Improving management strategies can reduce N2O emissions in agricultural systems by limiting optimal soil N and water conditions for the production of N2O. The objective of this study was to assess N2O emissions from different N management strategies under long-term tillage systems. Two N management strategies were evaluated: (a) source (compost and urea) and (b) placement (broadcast and surface-banded application of urea under conventional till and no-till systems). Overall, soil N2O emissions were affected by the availability of inorganic N and precipitation rather than tillage. Conventional till and no-till emissions were not significantly different. Banded application of N increased overall N2O emissions by 30% compared with broadcast N application without affecting yield and N uptake. In general, synthetic N fertilizers increased N2O emissions more than organic fertilizers, but organic fertilizer characteristics, such as the carbon content, could increase emissions.
引用
收藏
页码:1425 / 1436
页数:12
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