In order to explore the area of Yangzhou moist nitrogen on profile of soil migration rule, wheat and ryegrass on nitrogen absorption and utilization and the effectiveness of the crop for optimal fertilization and cropping systems and reduce the residual nitrate in the soil and to provide the theoretical basis of deep soil movement. The same of natural conditions rainfall and irrigated and supply of phosphorus and potassium on under the same conditions, with the conditions of the Yang mai 13 wheat and annual...
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