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| Non-leguminous winter cover crop and nitrogen rate in relation to double rice grain yield and nitrogen uptake in Dongting Lake Plain, Hunan Province, China |
| ZHU Bo1, 2, YI Li-xia1, XU He-shui2, GUO Li-mei2, HU Yue-gao2, ZENG Zhao-hai2, CHEN Fu1, 2, LIU Zhang-yong1 |
1 College of Agriculture, Yangtze University, Jingzhou 434025, P.R.China
2 College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, P.R.China |
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Abstract Annual ryegrass (Lolium multiflorum Lam.), a non-leguminous winter cover crop, has been adopted to absorb soil native N to minimize N loss from an intensive double rice cropping system in southern China, but a little is known about its effects on rice grain yield and rice N use efficiency. In this study, effects of ryegrass on double rice yield, N uptake and use efficiency were measured under different fertilizer N rates. A 3-year (2009–2011) field experiment arranged in a split-plot design was undertaken. Main plots were ryegrass (RG) as a winter cover crop and winter fallow (WF) without weed. Subplots were three N treatments for each rice season: 0 (N0), 100 (N100) and 200 kg N ha–1 (N200). In the 3-year experiment, RG reduced grain yield and plant N uptake for early rice (0.4–1.7 t ha–1 for grain yield and 4.6–20.3 kg ha–1 for N uptake) and double rice (0.6–2.0 t ha–1 for grain yield and 6.3–27.0 kg ha–1 for N uptake) when compared with WF among different N rates. Yield and N uptake decrease due to RG was smaller in N100 and N200 plots than in N0 plots. The reduction in early rice grain yield in RG plots was associated with decrease number of panicles. Agronomic N use efficiency and fertilizer N recovery efficiency were higher in RG plots than winter fallow for early rice and double rice among different N rates and experimental years. RG tended to have little effect on grain yield, N uptake, agronomic N use efficiency, and fertilizer N recovery efficiency in the late rice season. These results suggest that ryegrass may reduce grain yield while it improves rice N use efficiency in a double rice cropping system.
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Received: 07 December 2015
Accepted:
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| Fund: This study was supported by the National Natural Science Foundation of China (31501274, 31171509, 30671222, 31270488), the Special Fund for Agro-scientific Research in the Public Interest, China (201103001) and the National Key Technologies R&D Program of China during the 12th Five-Year Plan period (2011BAD16B15). |
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Corresponding Authors:
ZENG Zhao-hai, Tel: +86-10-62734884, Fax: +86-10-62732441,
E-mail: zengzhaohai@cau.edu.cn
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| About author: ZHU Bo, E-mail: 1984zhubo@163.com; |
Cite this article:
ZHU Bo, YI Li-xia, XU He-shui, GUO Li-mei, HU Yue-gao, ZENG Zhao-hai, CHEN Fu, LIU Zhang-yong.
2016.
Non-leguminous winter cover crop and nitrogen rate in relation to double rice grain yield and nitrogen uptake in Dongting Lake Plain, Hunan Province, China. Journal of Integrative Agriculture, 15(11): 2507-2514.
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