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On-farm evaluation of the improved soil N(min)-based nitrogen management for summer maize in North China Plain

文献类型： 外文期刊

作者： Cui, Zhenling 1 ; Chen, Xinping 1 ; Miao, Yuxin 1 ; Zhang, Fusuo 1 ; Sun, Qinping 1 ; Schroder, Jackie 2 ; Zhang, Hail 1 ;

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

2.Oklahoma State Univ, Dept Plant & Soil Sci, Stillwater, OK 74708 USA

3.Qingdao Agr Univ, Dept Agron, Qingdao 266023, Peoples R China

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

5.Shandong Agr Univ, Coll Resource & Environm Sci, Tai An 271018, Shandong, Peoples R China

6.Shanxi Acad Agr Sci, Inst Soil Sci & Fertil

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： 2008 年 100 卷 3 期

页码：

收录情况： SCI

摘要： The improved soil N(min)-based N management is a promising approach to precision N management, which determines the optimum side-dress N rates based on N target values and measured soil nitrate N content in the root soil layer at different growth stages. A total of 148 on-farm N-response experiments, in seven key summer maize (Zea mays L.) production regions of North China Plain (NCP) from 2003 to 2005, were conducted to evaluate the N(min)-based N management compared to traditional farmer's N practices. The recommended N rates based on the improved soil N(min) method were not significantly different (<= 31 kg N ha(-1)) from those determined by yield response curves (n = 13). The average N rate determined with the soil N(min) method (157 kg N ha(-1)) was significantly lower than farmer's practice (263 kg N ha(-1)), while maize grain yield was 0.4 Mg ha(-1) higher than farmer's N practice (8-5 Mg ha(-1)) across all sites (n = 148). As a result, the improved soil N(min)-based N management significantly increased net economic gains by $202 ha(-1), reduced residual nitrate N content and N losses by 44 kg N ha(-1) and 65 kg N ha(-1), respectively, and improved recovery N efficiency, agronomic N efficiency and N partial factor productivity by 16%, 6 kg kg(-1) and 36 kg kg(-1), respectively, compared with farmer's N practice. We conclude that the improved soil Nmin-based N management can be applied for summer maize production in NCP for improved N use efficiency and reduced environmental contamination.

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