不同农业施肥制度对红壤稻田土壤磷肥力的影响

采用田间定位试验研究了几种不同农业施肥制度对红壤稻田土壤磷肥力的影响．结果表明：（1）在移耕农业、施化学N肥和NK胆施肥制下，农田系统磷素亏缺量大，7年间达140mg/hm2以上，土壤有效磷降低；（2）有机农业和施化学P肥施肥制可促进农田系统磷素平衡，改善土壤供磷状况，提高稻株含磷量和磷累积量；（3）在有权无机结合施肥制下，农田系统土壤磷素盈余量大，7年间共达200mg／hm2以上，并可改善土壤磷组分，增加土壤有效磷含量，促进水稻对磷的吸收．

Effects of Different Fertilizer Application Systems on Phosphorus Fertility of Paddy Soil Derived from Red Soil

A plot experiment with different fertilizer application systems has been studied on phosphorus fertility of paddy soil derived from red soil. The results show as follotws: (1)The Phosphorus loss of systems was more than 140 mg/hm2 in seven years and the available phosphorus was lowered while the fertilizer appkication systems of transplanting agriculture, or application of N, or of NK were undertaken. (2)The phosphorus balance of systes was promoted, the phosphorus supplies was improved, and both the amount of phosphorus and the accumulation of phosphorus in rice were raisen under the fertilizer application systems of organic aghculture, or application of phosphate fenilizer.(3)The surplus of phosphorus of the systems was over 200 mg/hm2 in seven years, the available phosphorus was increased, and the absorption of phosphorus by the rice was improved when the fertilzer applicaion optems of organo-inorganic agriculture was applied.