Soil Nutrient Abundance Index and Recommended Fertilization Index of Sandy Soil for Spring Corn

According to results of‘3414’field fertilizer test and test of soil samples of spring corn in Yulin city of Shaanxi province from 2006 to 2015，and combined with production practice，soil nutrient abundance index and recommended fertilization index of sandy soil for spring corn in Yulin city were formulated.Principle of fertilization that organic-inorganic combination，reducing nitrogen，increasing phosphorus，supplementing potassium and supporting trace elements，anterior nitrogen backward shift and fractionated application were summarized.