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Nitrogen release from incorporated N-15-labelled Chinese milk vetch (Astragalus sinicus L.) residue and its dynamics in a double rice cropping system

文献类型： 外文期刊

作者： Zhu, Bo 2 ; Yi, Lixia 1 ; Hu, Yuegao 1 ; Zeng, Zhaohai 1 ; Lin, Chaowen 2 ; Tang, Haiming 3 ; Yang, Guangli 3 ; Xiao, Xiaoping 3 ;

作者机构： 1.China Agr Univ, Coll Agron & Biotechnol, Beijing 100193, Peoples R China

2.Sichuan Acad Agr Sci, Soil & Fertilizer Inst, Chengdu 610066, Peoples R China

3.Hunan Acad Agr Sci, Inst Soil & Fertilizer, Changsha 410125, Hunan, Peoples R China

关键词： Chinese milk vetch; Double rice; Nitrogen release; N-15 uptake; N dynamics

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN： 0032-079X

年卷期： 2014 年 374 卷 1-2 期

页码：

收录情况： SCI

摘要： Chinese milk vetch (Astragalus sinicus L. CMV), a leguminous cover crop, has been shown to provide N benefits to rice crops, but little is known about the pathway of incorporated CMV and its N dynamics. In this study, effects of CMV under different application treatments (incorporated alone, applied in conjunction with urea fertilizer and applied with ryegrass (Lolium multiflorum Lam.)) on N dynamics, rice yields and N uptake were investigated and compared with those of chemical fertilizer (CF) and no fertilizer (NF) in a double rice cropping system. Nitrogen release from incorporated CMV residue was quantified by using a bag method. Nitrogen dynamics of CMV were evaluated by using N-15-labelled fresh CMV tops and compared with those of CF (N-15-labelled urea). CMV residue decomposition pattern and its N release pattern followed a single exponential decay model, with 87.8-89.5 % of the applied CMV decomposed and 95.1-96.1 % of the original N released in the double rice season (177 days after fertilizer application). CMV treatments had higher rice N uptake efficiency than CF (39.2-51.3 % vs. 29.9 %) at the sum of early and late rice seasons. Rice yield, N accumulation and mineral fertilizer efficiency in CMV treated treatments were higher than those in CF. After two consecutive rice seasons the amounts of residual N remained in the soil were higher in the CMV treated fields than in CF (29.4-33.2 % vs. 14.1 %). CMV can be considered an efficient N source alternative to chemical fertilizer in double rice cropping systems.

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