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Optimization of nitrogen fertilizer rate under integrated rice management in a hilly area of Southwest China

文献类型： 外文期刊

作者： Dong, Yujiao 1 ; Yuan, Jiang 1 ; Zhang, Guangbin 2 ; Ma, Jing 2 ; Hilario, Padilla 3 ; Liu, Xuejun 4 ; Lu, Shihua 1 ;

作者机构： 1.Sichuan Acad Agr Sci, Soil & Fertilizer Res Inst, Key Lab Agr Environm Southwest Mt Areas, Minist Agr & Rural Affairs, Chengdu 610066, Peoples R China

2.Chinese Acad Sci, Inst Soil Sci, State Key Lab Soil & Sustainable Agr, Nanjing 210008, Peoples R China

3.Kadoorie Farm & Bot Garden, Hong Kong 999077, Peoples R China

4.China Agr Univ, Coll Resources & Environm Sci, Key Lab Plant Soil Interact, Minist Educ, Beijing 100193, Peoples R China

关键词： N input; N output; N-15 recovery efficiency; N surplus; N use efficiency; plastic mulch; soil surface N budget

期刊名称：PEDOSPHERE （ 影响因子：3.911； 五年影响因子：4.814 ）

ISSN： 1002-0160

年卷期： 2020 年 30 卷 6 期

页码：

收录情况： SCI

摘要： China has the world's highest nitrogen (N) application rate, and the lowest N use efficiency (NUE). With the crop yield increasing, serious N pollution is also caused. An in-situ field experiment (2011-2015) was conducted to examine the effects of three N levels, 0 (i.e., no fertilizer N addition to soil), 120, and 180 kg N ha(-1), using integrated rice management (IRM). We investigated rice yield, aboveground N uptake, and soil surface N budget in a hilly region of Southwest China. Compared to traditional rice management (TRM), IRM integrated raised beds, plastic mulch, furrow irrigation, and triangular transplanting, which significantly improved rice grain yield, straw biomass, aboveground N uptake, and NUE. Integrated rice management significantly improved N-15 recovery efficiency (by 10%) and significantly reduced the ratio of potential N-15 loss (by 8%-12%). Among all treatments, the 120 kg N ha(-1) level under IRM achieved the highest N-15 recovery efficiency (32%) and N-15 residual efficiency (29%), with the lowest N-15 loss ratio (39%). After rice harvest, the residual N fertilizer did not achieve a full replenishment of soil N consumption, as the replenishing effect was insufficient (ranging from -31 to -49 kg N ha(-1)). Furthermore, soil surface N budget showed a surplus (69-146 kg N ha(-1)) under all treatments, and the N surplus was lower under IRM than TRM. These results indicate IRM as a reliable and stable method for high rice yield and high NUE, while exerting a minor risk of N loss. In the hilly area of Southwest China, the optimized N fertilizer application rate under IRM was found to be 100-150 kg N ha(-1).

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