Analysis of Soil Fertility and Fertilization of Wheat Field in Shaanxi

In order to understand the soil fertility and fertilization condition of wheat field in Shaanxi province,the soil properties,wheat yield and fertilizer inputs of farmers were investigated in Weibei plateau,Guanzhong irrigation area and Qinba mountain area.The results showed that the contents of soil organic matter,available nitrogen,available phosphorus and available potassium in Shaanxi were14.3g·kg-1,69.0mg·kg-1,18.5mg·kg-1 and 148.4mg·kg-1,respectively.Compared with the 1980 s,the indexes increased 33.6%,40.8%,176.1%,and 6.8%,respectively.The inputs of nitrogen,phosphorus and potassium fertilizer were 183.0,109.5and 21.0kg·hm-2 after 2000,respectively.The nitrogen and phosphorus surplus in Shaanxi were 12.0and 51.0kg·hm-2,but the potassium deficiency was 115.5kg·hm-2.Therefore,the nitrogen fertilizer inputs should be suitably reduced,and phosphorus and potassium fertilizer input should be increased in Shaanxi province.