Effect of Excessive Fertilization on Soil Ecological Environment in the Facility Farmland

Through field investigation and chemical analysis,the reasons why soil ecological environment deteriorated on facility farmland were studied.Long-term using fertilizer excessively led to soil environment deteriorated.Soil available phosphorus and potassium were 691.9 mg·kg~(-1)and 623.5 mg·kg~(-1),respectively,which were at a high level of soil fertility.Soil organic matter,available nitrogen were 16.5 g·kg~(-1)and 138 mg·kg~(-1)respectively,which was at a low level.Soil salt was(0.168)%,and 80% of the samples had secondary salinification.The pH value tended to fall,decreasing 0.3 on facility farmland than that on farm land.Soil available manganese,copper and zinc were all at a middle or high level of soil fertility.There existed an imbalance between macroelement and microelement.According to these,some suggestions were proposed for improving the quality of the soil environment through fertilizer application,which provided the theoretic basis for prolonging the useful life of the facility farmland and boosting the ecological agriculture.