Critical Grain and Stover Nitrogen Concentrations at Harvest for Summer Maize Production in China
文献类型： 外文期刊
作者： Chen, Xinping 2 ; Zhang, Fusuo 1 ; Cui, Zhenling 1 ; Li, Junliang 4 ; Ye, Youliang 5 ; Yang, Zhiping 6 ;
作者机构： 1.China Agr Univ, Dep Plant Nutr, Coll Resources & Environm Sci, Beijing 100094, Peoples R China
2.Chinese Acad Sci, State Key Lab Soil Eros & Dryland Farming Loess P, Inst Soil & Water Conservat, Yangling 712100, Peoples R China
3.China Agr Univ, Dep Plant Nutr, Coll Resourccs & Environm Sci, Beijing 100094, Peoples R China
4.Qingdao Agr Univ, Coll Resourccs & Environm Sci, Qingdao 266023, Peoples R China
5.Henan Agr Univ, Coll Resourccs & Environm Sci, Zhengzhou 450000, Peoples R China
6.Shanxi Acad Agr Sci, Inst Soil Sci & Fertilizer, Taiyuan 030031, Peoples R China
关键词： grain yield;critical grain nitrogen concentration;critical stover nitrogen concentration
期刊名称：AGRONOMY JOURNAL （ 影响因子：2.24； 五年影响因子：2.829 ）
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收录情况： SCI
摘要： A uniform critical N concentration is desirable to serve as an indicator of N status and to guide agricultural practice and regulation. Our objective was to evaluate whether grain and stover N concentrations in summer maize (Zea mays L.) at harvest can serve as indicators of N status, and to determine a critical grain and stover N concentration (CGNC and CSNC) for maize production in China. At optimal nitrogen rate (ONR), grain N concentration was close to maximum, while stover N concentration was significantly lower, as calculated using a linear plus plateau model. Soil residual nitrate N content after harvest and N losses for maximum stover N concentration increased by 32 and 42 kg N ha(-1), as compared to values with ONR. Based on 141 on-farm N response experimental sites, CGNC and CSNC were 12.6 +/- 0.6 g kg(-1) (+/- CL0.05) and 8.1 +/- 0.8 g kg(-1) g kg(-1), respectively. An evaluation across 122 on-farm sites indicated that 70 and 66% of sites had grain and stover N concentrations less than the CGNC and CSNC at deficient (0 N control) N supply. When N was supplied in excess, 54% of sites had stover N concentrations greater than CSNC while only 14% of sites had grain N concentrations greater than the CGNC. This region wide study concluded that critical N concentrations were useful indicators of N deficiencies in maize production, but were less than reliable as indicators of excess N fertilization, in particular for grain N concentration.
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