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Regional Evaluation of Critical Nitrogen Concentrations in Winter Wheat Production of the North China Plain

文献类型： 外文期刊

作者： Cui, Zhenling 1 ; Zhang, Fusuo 1 ; Dou, Zhengxia 2 ; Miao Yuxin 1 ; Sun, Qinping 1 ; Chen, Xinping 1 ; Li, Junliang 3 ; Y 1 ;

作者机构： 1.China Agr Univ, Dep Plant Nutr, Coll Resources & Environ Sci, Beijing 100094, Peoples R China

2.Univ Penn, Sch Vet Med, Kennett Sq, PA 19348 USA

3.Qingdao Agr Univ, Coll Resources & Environ Sci, Qingdao 266109, Peoples R China

4.Henan Agr Univ, Coll Resources & Environ Sci, Zhengzhou 450000, Peoples R China

5.Shanxi Acad Agric Sci, Inst Soil Sci & Fertilizer, Taiyuan 030031, Peoples R China

6.Shandong Agr Univ, Coll Resources & Environ Sci, Tai An 271018, Shandong, Peoples R China

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

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

ISSN：

年卷期：

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收录情况： SCI

摘要： Investigating critical nitrogen concentration (CNC) in grain and straw provides insights into N nutrition, and can serve as a guide to improved agricultural practice. This regional study evaluated the relationship between N fertilization rate and grain yield, N concentration, potential N loss, and determined critical grain and straw nitrogen concentrations (CGNC and CSNC) for winter wheat (Triticum aestivum L.) production in China. At the economically optimum nitrogen rate (EONR), grain N concentration was similar to the maximum value calculated using a linear plus plateau model, while straw N concentration was significantly less than the relevant maximum value. Soil nitrate N content after harvest and apparent N loss for maximum straw N concentration increased by 19 and 9 kg N ha-1 compared to values at the EONR. Based on nine field experiments, CGNC and CSNC corresponding to optimal N rate were established to be 21.9 g kg-1 (20.8-23.0 g kg-1) and 6.8 g kg-1 (6.5-7.1 g kg-1), respectively. An evaluation of CGNC and CSNC across 111 on-farm sites indicated that while many sites had grain and straw N concentrations falling within the CGNC and CSNC, a substantial portion of the sites had grain and straw N concentrations falling outside of the CGNC and CSNC or falling within the critical ranges when N supply was deficient (0 N control) or excess (at farmer's N practice). This region-wide study provided evidence for the usefulness of CSNC, and particularly CGNC, as indicators of N deficiencies in wheat production; however, neither indicator provided information about excess N fertilization.

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