N-15 fate in maize cropping system in response to black soil fertility improvement in China

文献类型： 外文期刊

第一作者： Fu, HaiMei

作者： Fu, HaiMei;Duan, YingHua;Xu, MingGang;Fu, HaiMei;Zhu, Ping;Gao, HongJun

作者机构：

期刊名称：AGRONOMY JOURNAL （ 影响因子：2.24； 五年影响因子：2.829 ）

ISSN： 0002-1962

年卷期： 2021 年 113 卷 5 期

页码：

收录情况： SCI

摘要： Applications of high amounts of nitrogen (N) fertilizer are essential for obtaining sustainable maize (Zea mays L.) yields but also result in low N-use efficiency (NUE) and cause a series of environmental problems. To optimize fertilizer management, it is necessary to determine the effects of soil fertility improvement on NUE and the fate of N fertilizer. In this study, we conducted a N-15 tracer pot experiment involving five different fertilizer treatments in soils with five different total organic carbon levels under field conditions. The average NUE ranged from 36 to 56% N-15-urea and 0.1 to 0.2% residual N in the first and second seasons. The N retained in the soil ranged from 10 to 28%, and the N lost to water and the atmosphere ranged from 29 to 39% in the five soils. Compared with that in the low-fertility soils, NUE in the high-fertility soils was 20-45% greater, and N loss was 1 -6% lower. The results showed that higher soil fertility corresponded to higher NUE and lower N loss. We suggest that although the local customary N fertilizer application rate (N3; 165 kg N/ha) in the study area is reasonable for low-fertility soils, after soil fertility improvements, an approximately 50% reduction of N fertilizer should be implemented.

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