Effects of Rotations and Fertilizations on Soil Fertility on Upland of Loes Plateau

It was studied that fertilization,crop type and planting ways affected soil soil total organic carbon,total nitrogen and available phosphorus content accrding to data of a long term experiment.Long term fertilization and planting increased the content of soil total organic carbon,total nitrogen and available phosphorus content.Especially,solely application of phosphorus chemical fertilizer can enhance available phosphorus significantly.The nutrient content of soil profile affected by planting alfalfa,there was the positive correlation between soil total organic carbon content and the yield of winter wheat.