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[目的]通过开展紫云英-早稻肥效试验,合理确定在早稻作物上施用紫云英后化肥减量水平,为指导仙桃市早稻科学施肥提供依据。[方法]在早稻田设置紫云英-早稻肥效试验,分析各处理间土壤肥力变动情况和产量差异水平,科学建立施用紫云英后早稻施肥指标。[结果]在早稻田施用紫云英,可以降低土壤pH和容重,提升土壤速效氮磷钾和有机质含量,提高早稻的养分利用率和经济效益。[结论]在早稻施用紫云英后,以减施20%的化肥效果最好、最佳经济施用量为N 115.2 kg/hm2、P2O570.8 kg/hm2、K2O 98 kg/hm2。
[Objective] The research aimed to determine the level of chemical fertilizer reduction after applying Astragalus membranaceus to early rice crops by means of carrying out the experiment of fertilizer efficiency of Astragalus sinicus-early rice, and providing the basis for the scientific fertilization of early rice in Xiantao. [Method] The experiment of fertilizer efficiency of Astragalus buds and early rice was set up in the early rice paddy so as to analyze the change of soil fertility and the difference of yield in each treatment. The fertilization index of early rice after applying Astragalus mongolica was scientifically established. [Result] The application of Astragalus sinicus in the paddy field could reduce the soil pH and bulk density, increase the contents of available N, P, K and soil organic matter, and improve the nutrient utilization rate and economic benefit of early rice. [Conclusion] The best economic application was N 115.2 kg / hm2, P2O5 70.8 kg / hm2 and K2O 98 kg / hm2 after the early rice was treated with the chemical fertilizer with 20% reduction of the application rate.