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Optimizing Fertilizer Nitrogen for Winter Wheat Production in Yangtze River Region in China

文献类型： 外文期刊

作者： Yi, Q. 2 ; He, P. 1 ; Zhang, X. Z. 1 ; Yang, L. 3 ; Xiong, G. Y. 3 ;

作者机构： 1.Chinese Acad Agr Sci, Minist Agr, Key Lab Crop Nutr & Fertilizat, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

2.Guangdong Acad Agr Sci, Inst Agr Resources & Environm, Guangdong Key Lab Recycling Nutr Resources & Land, Guangzhou, Guangdong, Peoples R China

3.Hubei Acad Agr Sci, Inst Plant Protect & Soil Fertilizat, Wuhan, Peoples R China

关键词： Yangtze River region.;nitrogen;SPAD;winter wheat;optimizing fertilization

期刊名称：JOURNAL OF PLANT NUTRITION （ 影响因子：1.707； 五年影响因子：1.645 ）

ISSN：

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收录情况： SCI

摘要： Excessive nitrogen (N) application has been considered as one of the reasons for restricting yield increases in rice-wheat rotation system in the Yangtze River area. From 2007 to 2009, field experiments were conducted to evaluate the effects of optimized N management on grain yield, nitrogen use efficiency (NUE) and N surplus of winter wheat in Jianghan Plain (Hubei province, China). Results indicated that grain yield and crop N uptake of treatments with reducing fertilizer N (N-135(2) for the first year and N-120(3) for the second season) did not significantly reduce yield compared to farmers' practice (FP). Under the same amount of N application, three-time splitting improved grain yield and enhanced NUE as compared with two-time splitting. The optimized N treatment of N-135(2) and N-120(3) was observed with higher NUE parameters, i.e. recovery efficiency (REN), agronomic efficiency (AE(N)) and partial factor productivity (PFPN). Positive correlation between SPAD value and leaf N concentration provided the effective tool to evaluate N status during the growth season. The optimized N rate and top dressing frequency could reduce the residual N retained in the 0-20cm soil layer after harvest, which could reduce the possibility of soil N loss to the environment. This paper provides insights into N management strategy based on farmers' practices, which could be regarded as a guideline to improve agricultural management for wheat growth season.

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