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| Application of Chinese milk vetch affects rice yield and soil productivity in a subtropical double-rice cropping system |
CHEN Jing-rui1, QIN Wen-jing1, CHEN Xiao-fen1, CAO Wei-dong2, QIAN Guo-min3, LIU Jia1, XU Chang-xu1 |
1 Institute of Soil & Fertilizer and Resources & Environment, Jiangxi Academy of Agricultural Sciences, Nanchang 330200, P.R.China
2 Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, P.R.China
3 Dengjiabu Original Rice Breeding Farm, Yingtan 335000, P.R.China |
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Abstract Green manure can be used as a substitute for chemical fertilizer without reducing rice yield. We studied the responses of soil fertility and rice yield to different combinations of Chinese milk vetch (CMV; Astragalus sinicus L.) and chemical fertilizer in a subtropical double-rice cropping system. Our goal is to reduce chemical fertilizer use and decrease environmental contamination. Compared with the recommended rate of chemical fertilizer (CF), both early- and late-rice yields in the two treatments supplied with 15 and 22.5 Mg CMV ha–1 plus 60% CF (represented as 60A and 60B, respectively) showed no significant differences while the two treatments supplied with 30 and 37.5 Mg CMV ha–1 plus 60% CF (represented as 60C and 60D, respectively) showed significantly higher values. The sustainable yield index (SYI) values in the 60C and 60D treatments with double-rice croppong system were significantly higher than those in other treatments (P<0.05). Early-rice yield showed a significant positive relationship with the Chinese milk vetch incorporation rate. The coefficients increased annually from 2009 to 2013 and then decreased in 2014. Soil organic matter increased over time by the end of the experiment in all of the treatment groups. Soil organic matter in 60A, 60B and 60C showed no significant difference compared with that in CF, while soil organic matter in 60D was significantly higher than that in CF. The slopes of soil organic matter and total nitrogen over six years were the highest in 60C and 60D. The soil total nitrogen content in 60A, 60B, 60C and 60D was higher than that in CF, but the differences were not significant (P>0.05). Therefore, a relatively high Chinese milk vetch incorporation rate (≥30 Mg ha–1) was more effective in improving the productivity and sustainability of paddy soil. The decreased coefficients of early-rice yield and the Chinese milk vetch incorporation rate in 2014 implied that the benefits of soil fertility and rice yield created by Chinese milk vetch input may decline after five years under a continuously high rate of Chinese milk vetch incorporation.
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Received: 17 June 2019
Accepted:
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| Fund: This research was funded by the National Key Research and Development Program of China (2016YFD0800500 and 2016YFD0200800), the National Natural Science Foundation of China (31860592), the earmarked fund for China Agriculture Research System (CARS-22-Z-06), the Special Scientific Research Fund of Agricultural Public Welfare Profession of China (201503123 -07), and the Innovation Fund of Jiangxi Academy of Agricultural Sciences, China (2015CBS007 and 20182CBS002 ). |
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Corresponding Authors:
Correspondence LIU Jia, Tel: +86-791-87090702, E-mail: liujia422@126.com; XU Chang-xu, Tel: +86-791-87090702, E-mail: changxux@sina.com
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| About author:
CHEN Jing-rui, Tel: +86-791-87090702, E-mail: chenjr5526@163.com; |
Cite this article:
CHEN Jing-rui, QIN Wen-jing, CHEN Xiao-fen, CAO Wei-dong, QIAN Guo-min, LIU Jia, XU Chang-xu.
2020.
Application of Chinese milk vetch affects rice yield and soil productivity in a subtropical double-rice cropping system. Journal of Integrative Agriculture, 19(8): 2116-2126.
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