Effect of nitrogen fertilization on growth and nitrogen dynamics of Chamaecrista rotundifolia cv. Minyin on red soil in southern China
文献类型： 外文期刊
作者： Weng, Boqi 1 ; Li, Yuesen 2 ; Wang, Yixiang 1 ; Li, Yanchun 1 ;
作者机构： 1.Fujian Acad Agr Sci, Agr Ecol Inst, Fuzhou 350013, Fujian, Peoples R China
2.Fujian Acad Agr Sci, Sugarcane Res Inst, Zhangzhou, Fujian, Peoples R China
关键词： N-15 isotope dilution method;biological nitrogen fixation;leguminous forage;nitrogen use efficiency;red soil
期刊名称：GRASSLAND SCIENCE （ 影响因子：1.65； 五年影响因子：1.569 ）
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收录情况： SCI
摘要： A leguminous forage plant, round-leaf cassia (Chamaecrista rotundifolia (Pers.) Greene cv. Minyin), is ecologically important in the hilly, red soil regions of southern China. This study investigated the effects of nitrogen (N) fertilization at the rates of 0, 30, 60, 90 and 120kg ha-1 on the growth and N dynamics (including biological N fixation, N uptake, N accumulation and fate of N fertilizer) of the pot-grown Minyin in an attempt to optimize the fertilization. The increased fertilization increased the percentage of N derived from the fertilizer (P<0.01), but decreased that from the soil (P<0.05) and also reduced the number of root nodules (P<0.01). At 60kg ha-1 application rate, the N fixation efficiency (NFE) of the plant peaked at 29.5% and the N use efficiency (NUE) of the fertilizer at 27.9%. When the highest rate of fertilization (120kg ha-1) was applied, NFE was significantly decreased (11.1%) and NUE reduced to 23.0%. It showed that Minyin was highly efficient (varying from approximately 11-30% NFE) in fixing N from the atmosphere, and could suitably be promoted for the N-deficient hilly, red soil regions in southern China.
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