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

文献类型： 外文期刊

作者： Cui, Zhenling 1 ; Zhang, Fusuo 1 ; Chen, Xinping 1 ; Miao, Yuxin 1 ; Li, Junliang 2 ; Shi, Liwei 2 ; Xu, Jiufei 2 ; Ye, Y 1 ;

作者机构： 1.China Agr Univ, Coll Resources Environm Sci, Dept Plant Nutr, Beijing 100094, Peoples R China

2.Coll Agron Laiyang, Dept Agron, Laiyang 265200, Peoples R China

3.Henan Agr Univ, Coll Resource & Environm Sci, Zhengzhou 450000, Peoples R China

4.Shandong Agr Univ, Coll Resource & Environm Sci, Tainan 271018, Taiwan

5.Shanxi Agr Univ, Inst Soil Sci & Fertilizer, Taiyuan 030031, Peoples R China

6.Henan Acad Agr Sci, Inst Soil Sci & Fertilizer, Zhengzhou 450000, Peoples R China

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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