【摘要】 基于长期定位试验研究了紫云英翻压还田与化肥配施对土壤肥力以及双季稻产量的影响。结果表明,在肥力相对较低的桐城点,经过7年紫云英翻压配施70%化肥明显提高了土壤有机质(SOM)含量。在肥力相对较高的池州点,经过3年紫云英处理的土壤SOM和全氮(TN)都显著高于单施化肥处理;且紫云英配施化肥后SOM和TN分别比单施化肥提高13.08%和6.57%,但单施紫云英处理的碱解氮和速效钾含量却低于单施化肥处理。桐城点,减施30%化肥配合紫云英处理的早晚稻及周年产量高于单施化肥,早稻增产更为显著;且产量与TN呈显著正相关。池州点,单施紫云英的早晚稻及水稻周年产量与单施化肥相比,出现明显减产。综上认为紫云英翻压还田不能完全替代化肥,但与70%化肥配施既能提升土壤肥力、又能保证水稻产量。更多还原

【Abstract】 The effects of Chinese milk vetch(GM) combined with chemical fertilizers on soil fertility and the yield of double cropping rice were studied based on the long-term field experiments. The results showed that the content of soil organic matter(SOM) in the treatment of incorporation of GM combinedwith 70% fertilizer(70 F1 + GM) for 7 years was increased at the located experiment with relatively lower soil fertility in Tongcheng. At the located experiment with relatively higher soil fertility in Chizhou during three years, the contents of SOM and total nitrogen(TN) in the treatment of the incorporation of GM only were higher than those in the treatment of 100% fertilizer applied(100 F2). Compared with the 100 F2 treatment, the application of GM combined with fertilizer(100 F2+GM)increased the contents of SOM and TN by 13.08% and 6.57%, respectively. The available nitrogen(AN) and available potassium(AK) inthe treatment of only application of GM were both lower than thosein the 100 F2 treatment yet. At Tongcheng, the yields of early and late rice and their annual yields in the treatment of 70 F1 + GM were higher than those in the treatment of 100 F2, especially for the early rice. And there was a positive correlation between rice yield and soil TN. At Chizhou, compared with the treatment of 100 F2, the yield of double cropping ricein the treatment of only application of GM was decreased markedly. From the above, the GM combined with 70% chemical fertilizercould improve soil fertility and increase rice yield.更多还原