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Long-term green manuring enhances crop N uptake and reduces N losses in rice production system

文献类型： 外文期刊

作者： Liang, Hao 1 ; Li, Shun 2 ; Zhang, Lei 2 ; Xu, Changxu 3 ; Lv, Yuhu 4 ; Gao, Songjuan 2 ; Cao, Weidong 5 ;

作者机构： 1.Hohai Univ, Coll Agr Sci & Engn, Nanjing 210098, Peoples R China

2.Nanjing Agr Univ, Coll Resources & Environm Sci, Nanjing 210095, Peoples R China

3.Jiangxi Acad Agr Sci, Nanchang 330200, Jiangxi, Peoples R China

4.Xinyang Acad Agr Sci, Xinyang 464000, Peoples R China

5.Chinese Acad Agr Sci, Minist Agr & Rural Affairs, Key Lab Plant Nutr & Fertilizer, Inst Agr Resources & Reg Planning, Beijing 100081, Peoples R China

关键词： Green manure; Rice; Crop N uptake; N losses; Soilcrop modeling

期刊名称：SOIL & TILLAGE RESEARCH （ 影响因子：7.366； 五年影响因子：7.829 ）

ISSN： 0167-1987

年卷期： 2022 年 220 卷

页码：

收录情况： SCI

摘要： Green manuring is a potential method for reducing chemical N fertilizer input and reactive N losses to the environment that can achieve dual goals of food security and green development of agriculture. In this study, three long-term field experiments in south China and process-based model (WHCNS_LIXIM model) were combined to examine effects of long-term green manure substitution on soil N supply, crop N uptake, and N losses in rice production system. Results showed that green manure substitution significantly improves soil mineral N by 27.4-94.9% and 1.0-45.0% at jointing and maturity stages, respectively, compared with the use of chemical N alone. Moreover, 18.4-62.2% of crop N uptake increased at the maturity stage at Xinyang and Yujiang sites. The model demonstrated satisfactory performance in modeling dynamics of soil mineral N, crop N uptake, crop dry matter, and grain yield of the rice-green manure system with a determination coefficient (R-2) > 0.967 and slope of linear regression equation (beta) close to 1.0. Simulated N budgets presented that green manure reduces 20-40% of the chemical N fertilizer input and decreased 5.5%, 25.1%, and 30.6% of N losses by ammonia volatilization, leaching, and runoff, respectively, when green manure application rates (fresh matter) are less than 30 t ha(-1). However, the total N loss increased with the increase of green manure application amounts when application amounts are larger than 30 t ha(-1). These findings indicated that the further reduction of chemical N fertilizer was needed when the application amount of milk vetch was higher than 30 t ha(-1). A milk vetch application of 15-30 t ha(-1) was recommended to substitute 20-40% of chemical N fertilizer to improve crop N uptake and reduce N losses, and develop green rice production system in the study areas.

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