On-farm evaluation of an in-season nitrogen management strategy based on soil N-min test

文献类型： 外文期刊

第一作者： Cui, Zhenling

作者： Cui, Zhenling;Zhang, Fusuo;Chen, Xinping;Miao, Yuxin;Li, Junliang;Shi, Liwei;Xu, Jiufei;Ye, Youliang;Liu, Chunsheng;Yang, Zhiping;Zhang, Qiang;Huang, Shaomin

作者机构：

关键词： soil N-min test;N losses;in-season N management;N use efficiency;N balance

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

ISSN： 0378-4290

年卷期： 2008 年 105 卷 1-2 期

页码：

收录情况： SCI

摘要： Successful nitrogen (N) management requires better synchronization between crop N demand and N supply from all sources throughout crop growing season. An in-season N management strategy based on soil N,; test had been developed under experimental conditions, and more than half-N fertilizer could be saved without grain yield losses, compared with farmer's N management practices. The objective of this study was to evaluate this in-season N management strategy for winter wheat (Triticum aestivum L.) in different farmers' fields of North China Plain (NCP). A total of 121 on-farm N-response experiments (check with no N fertilizer, in-season N management based on soil N-min test, and farmer's practice) were conducted in seven key winter wheat production regions of NCP from 2003 to 2005. The average N rate determined with in-season N management strategy (128 kg N ha(-1)) was significantly lower than farmer's practice (325 kg N ha(-1)) without wheat grain yield losses. As a result, in-season N management strategy significantly increased economic gains by $144 ha(-1), reduced residual nitrate-N content in the top 90 cm soil layer and N losses by 81 and 118 kg N ha(-1), respectively (P < 0.05). Recovery N efficiency (REN), agronomic N use efficiency (AEN) and N partial factor productivity (PFPN) were significantly improved to 44%, 11 and 56 kg kg(-1), respectively, compared with farmer's N practice (REN, 18%; AEN, 3 kg kg(-1); PFPN, 20 kg kg(-1)). Effective use of soil N supply and better synchronization between crop N demand and supply were main reasons for the increased N use efficiency. We conclude that the in-season N management strategy based on soil N-min test can be applied for winter wheat production in NCP for improved N use efficiency and reduced environmental contamination. (c) 2007 Elsevier B.V. All rights reserved.

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