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

doi:10.1016/S2095-3119(16)61331-X

Journal of Integrative Agriculture ›› 2016, Vol. 15 ›› Issue (11): 2507-2514.DOI: 10.1016/S2095-3119(16)61331-X

收稿日期:2015-12-07 出版日期:2016-11-04 发布日期:2016-11-04

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 Bo^{1, 2}, YI Li-xia¹, XU He-shui², GUO Li-mei², HU Yue-gao², ZENG Zhao-hai², CHEN Fu^{1, 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

Received:2015-12-07 Online:2016-11-04 Published:2016-11-04
Contact: ZENG Zhao-hai, Tel: +86-10-62734884, Fax: +86-10-62732441, E-mail: zengzhaohai@cau.edu.cn
About author:ZHU Bo, E-mail: 1984zhubo@163.com;
Supported by:
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).

摘要/Abstract

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.

Key words: double rice , grain yield , N uptake , N use efficiency , winter cover crop

ZHU Bo, YI Li-xia, XU He-shui, GUO Li-mei, HU Yue-gao, ZENG Zhao-hai, CHEN Fu, LIU Zhang-yong. [J]. Journal of Integrative Agriculture, 2016, 15(11): 2507-2514.

ZHU Bo, YI Li-xia, XU He-shui, GUO Li-mei, HU Yue-gao, ZENG Zhao-hai, CHEN Fu, LIU Zhang-yong. 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[J]. Journal of Integrative Agriculture, 2016, 15(11): 2507-2514.

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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

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