关键词: 农产品价格, 农产品价格, 干旱灾害, 云南省, 面板数据

Abstract: Investigation of the structure of applied fertilizers in farming systems can provide a basis for understanding the problems in fertilizer application, and improving the program of soil testing and formulated fertilization. Thirty-one farmland fields in Jiande city were selected for five year-continuous monitoring of fertilizer structure, and the differences in application amounts and rates of nitrogen, phosphorus, and potassium, and compositions of organic manure and chemical fertilizers of eight kinds of farming systems were compared. The results showed that farmland fertilizer inputs in the city varied greatly with planting systems and farmers, total input of N, P2O5, and K2O ranged from 219.45 to 1526.55 kg/hm2, with a average of 734.70 kg/hm2. There was a phenomenon of excess fertilizer application for part of the farmlands. In recent years, manure application rate increased, and contribution of organic manure to total nutrients of nitrogen, phosphorus, potassium in farming systems averaged about 10.89%. Average ratios of N: P2O5: K2O in the fertilizers were about 1:0.6:0.6. The amounts of fertilizer application of economic crops were significantly higher than those of grain crops, and the organic fertilizer and phosphorus, potash fertilizer was preferentially applied to economic crops. Combined application of organic manure and chemical fertilizer, and NPK ratios of the applied fertilizers in present farming systems for the city are not very reasonable. In order to improve the productivity of cultivated land, it is necessary to increase efforts to promote the application of organic fertilizer, and increase the application amounts of phosphorus, potassium and organic fertilizer in agricultural fields with food crop production.