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Estimation of nitrogen supply for winter wheat production through a long-term field trial in China

文献类型： 外文期刊

作者： Huang, Shaohui 1 ; Ding, Wencheng 1 ; Yang, Junfang 2 ; Zhang, Jiajia 1 ; Ullah, Sami 1 ; Xu, Xinpeng 1 ; Liu, Yingxia 1 ;

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

2.Hebei Acad Agr & Forestry Sci, Hebei Fertilizer Technol Innovat Ctr, Inst Agr Resources & Environm, Shijiazhuang 050051, Hebei, Peoples R China

关键词： Total nitrogen supply; Relative yield; Nitrogen use efficiency; Winter wheat

期刊名称：JOURNAL OF ENVIRONMENTAL MANAGEMENT （ 影响因子：6.789； 五年影响因子：6.914 ）

ISSN： 0301-4797

年卷期： 2020 年 270 卷

页码：

收录情况： SCI

摘要： Excessive synthetic nitrogen (N) applications, high mineral N accumulation and low N use efficiency (NUE) are current issues in intensively cultivated winter wheat production system impeding the sustainable development of agriculture in China. To solve these problems, soil accumulated N in the top 1 m of the soil profile before sowing (N-soil), returned straw-N from the previous maize crop (N-straw) and fertilizer N application (N-fertilizer) should be comprehensively considered N supply sources in N management. As such, the objective of this research was to determine the optimal total N supply (TNsupply) level needed to meet crop requirements while minimizing environmental impacts. A 9-year on-farm experiment was conducted in accordance with a split-plot design involving two different fertilizer management systems (main treatments) and three N application strategies (sub treatments). Extensive TNsupply levels (ranging from 61 kg ha(-1) to 813 kg ha(-1)) were detected, and relative yield (RY), N input and N output in response to the TNsupply were measured. The relationships between TNsupply and RY, N input, and N output strongly fit linear-plateau, linear, and linear-plateau models, respectively. The minimum TNsupply levels needed to achieve the maximum RY and N output were 325 and 392 kg ha(-1), respectively. On the basis of N supply capacity, the TNsupply was removed from the growing system by 61% (N input). As the N input increased past 209 kg ha 1, the NUE declined, at which point the TNsupply reached 433 kg ha(-1). Therefore, the suitable TNsupply should range from 325 kg ha(-1) (ensuring a total N supply for high yield and N uptake) to 433 kg ha(-1) (obtaining a relatively higher NUE and less N loss to the environment). The TNsupply was highlighted to be an indicator for use in N management recommendations. Considering the average high N accumulation in winter wheat production systems, N management should essentially take into account the consumption of N-soil, the levels of N-straw and the minimum application of N-fertlizer to obtain high yields while minimizing environmental impacts under suitable TNsupply levels.

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