Characteristics of Soil Nutrient Under Different Age Apple Orchards on Weibei Dryland of the Loess Plateau

To explore the soil total nitrogen, total phosphorus in the same age distribution characteristics in the orchard, and thus the local apple orchard scientific fertilization management and sustainable development of land to provide a theoretical basis. On Wangdonggou, Weibei dry land of the Loess Plateau, they selected the year of 1, 5, 10 15 and 20 of the orchard and farmland as the research sample, Layered 0~10cm、10~20cm as soil samples, and use the Flowsys instrument to determine in order to analyze the changes of the total Nitrogen and phosphorus in the soil. The results indicated that with increasing years of apple planting, there exist significant differences in content of the total nitrogen and total phosphorus of the surface soil( p 0.05).the longer the Apple planting years, the lower the content of total nitrogen, the higher the content of total phosphorus. In vertical direction, with the increase of the depth of soil, total nitrogen and total phosphorus declined slightly. On the basis of balanced fertilization and nutrient character, timely and quantitatively regulate soil nutrients, thereby the orchard soil quality and the level of sustainable development of agriculture are to be increased.