Response of winter wheat yield and soil N2O emission to nitrogen fertilizer reduction and nitrapyrin application in North China Plain

文献类型： 外文期刊

第一作者： Bhandari, Mohan

作者： Bhandari, Mohan;Ma, Yang;Men, Mingxin;Wu, Min;Xue, Cheng;Wang, Yanqun;Peng, Zhengping;Bhandari, Mohan;Ma, Yang;Men, Mingxin;Wu, Min;Xue, Cheng;Wang, Yanqun;Peng, Zhengping;Li, Yingchun

作者机构：

关键词： Winter wheat; different nitrogen management practices; nitrapyrin; N2O emission; nitrogen use efficiency

期刊名称：COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS （ 影响因子：1.327； 五年影响因子：1.315 ）

ISSN： 0010-3624

年卷期： 2020 年 51 卷 4 期

页码：

收录情况： SCI

摘要： Over-fertilization could lead to nitrogen (N) losses and environmental risks, and the appropriate nitrogen fertilizer could reduce the nitrous oxide (N2O) emission and increase the N utilization of crops in the North China Plain. We investigated the effects of rationally reduced N fertilizer input and nitrapyrin (CP) application on N2O dynamic emission, soil N balance, yield, N utilization and net income during the whole wheat season. Five fertilization treatments included zero N (CK), farmers' traditional N rate (FN), recommended N rate (RN), the 20% reduction of RN (80%RN) and the 20% reduction of RN added with CP (80%RN+CP). The N2O emission fluxes from seedling stage to greening stage contributed to 51.1%-74.2% during the whole wheat growth stages. Moreover, the first peak of N2O emission was observed within half a month after N basal fertilizer, irrigation, and sowing, which was two times higher than the other peaks occurred after N top-dressing and irrigation. The cumulative N2O emission and N2O emission factor were significantly declined by 27.3%-43.4% and 8.9%-51.1% with 80%RN and 80%RN+CP as compared to FN, respectively. Grain yield, agronomic N use efficiency, apparent N use efficiency and N production efficiency with 80%RN+CP were increased by 1.74%-10.83%, 0.9-8.91 kg kg(-1), 1.9%-27.5% and 1.22-22.79 kg kg(-1) than other N treatments, respectively. Moreover, 80%RN+CP also decreased N loss by 7.88-55.62 kg ha(-1) as compared to FN and RN, which resulted in less soil NO3- retention. Consequently, the application of nitrapyrin with 20% reduction of N rate should be recommended to increase winter wheat economic benefits and mitigate environmental pollution in North China Plain.

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