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Variability of N, P and K Contents of the Greenhouse Soil in Different Planting Years in Irrigation Regions of Ningxia

Wang Julan 1,He Wenshou 2 (1.School of Agriculture,Ningxia University,Yinchuan 750021, China; 2.Science and Technology Division, Ningxia University,Yinchuan 750021, China)  
Based on distributing locations of the greenhouse in irrigation regions of Ningxia,the soil samples in different layers (0~15cm,15~30cm,30~60cm) were collected by means of random sampling for both the different greenhouses and various planting years,respectively.The variational properties of the nutrient contents of nitrogen,phosphorus and potassium in the tested soils were analyzed.The results showed that total N, alkali-hydrolyzable N, nitrate N , total P, available P and readily available K contents increased with planting ages from one to nine years, but the increased rates were different in several layers(0~15cm,15~30cm,30~60cm). There were the highest level of total N, alkali-hydrolyzable N, nitrate N, total P, available P and readily available K contents from seven to nine years in the greenhouse soils and there were significant difference at 5% level in different planting years.
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