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Spatial and temporal nitrogen applications for winter wheat in a loamy soil in south-eastern China

文献类型： 外文期刊

作者： Chen, Zhaoming 1 ; Wang, Huoyan 1 ; Liu, Xiaowei 1 ; Chen, Xiaoqin 1 ; Lu, Dianjun 1 ; Jia, Yunsheng 1 ; Zhou, Jianmin 1 ;

作者机构： 1.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210018, Jiangsu, Peoples R China

2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

3.Zhejiang Acad Agr Sci, Inst Environm Resource & Soil Fertilizer,

关键词： N-15;N dose;N-use efficiency;Nitrogen application method

期刊名称：NUTRIENT CYCLING IN AGROECOSYSTEMS （ 影响因子：3.27； 五年影响因子：3.767 ）

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收录情况： SCI

摘要： Split application of nitrogen (N), applied by broadcasting, is both time consuming and inconvenient; yet it is widely practised for wheat. Simplified N fertilization is necessary for wheat in south-eastern China. One-time band application was compared with split application using three doses of N (150, 195, and 240 kg ha(-1)) in 2014/2015 and 2015/2016. Grain yield and N-use efficiency of winter wheat were determined over two consecutive seasons. A corresponding micro-plot trial using N-15-labelled urea was conducted only in 2015/2016 to measure the fate of urea-N-15. The two methods showed no difference in grain yield, except at 240 kg ha(-1) of N in 2014/2015. The average grain N concentration (18.2 g kg(-1)) was slightly lower in band application than that in broadcast application (19.2 g kg(-1)), but there was no significant difference (P > 0.05). In 2014/2015, N apparent recovery efficiency ranged from 33.1 to 49.9%; N agronomic efficiency, from 8.9 to 38.9 kg kg(-1); and N partial factor productivity, from 23.6 to 38.4 kg kg(-1). In 2015/2016, the corresponding values were 29.4-38.6%, 13.5-38.6, and 24.3-33.9 kg kg(-1). In the micro-plot trial, compared to split application, fertilizer N recovery in winter wheat in one-time band application was lower by 26.5% and increased the unaccounted-N loss by 21.7%. Thus, considering environmental impacts, one-time band application of N at sowing is not a suitable alternative to broadcast application in split doses for winter wheat in the loamy soils of south-eastern China.

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