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Impact of nitrogen management and tillage practices on nitrous oxide emissions from rainfed corn
Soil Science Society of America Journal ( IF 2.4 ) Pub Date : 2021-06-04 , DOI: 10.1002/saj2.20285
Miguel A. Arango 1 , Charles W. Rice 2
Affiliation  

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.

中文翻译:

氮管理和耕作方式对雨养玉米中一氧化二氮排放的影响

超过 85% 的人为 N 2 O 排放与农业土壤的 N 富集有关。改进管理策略可以通过限制生产 N 2 O 的最佳土壤 N 和水条件来减少农业系统中的N 2 O 排放。本研究的目的是评估长期耕作下不同 N 管理策略的N 2 O 排放系统。评估了两种氮管理策略:(a)源(堆肥和尿素)和(b)放置(在传统耕作和免耕系统下广播和表面带状应用尿素)。总体而言,土壤 N 2O 排放受无机氮和降水的影响,而不是耕作。传统的耕作和免耕排放没有显着差异。与撒施氮肥相比,分批施氮使 N 2 O 总排放量增加了 30%,而不会影响产量和氮吸收。一般来说,合成氮肥比有机肥增加的 N 2 O 排放量更大,但有机肥的特性,如碳含量,可能会增加排放量。
更新日期:2021-06-04
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