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：

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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。