Dynamic change of soil nutrient in free tillage spring wheatgrass intercropping land

The experiment studied dynamic change of soil nutrient in free tillage spring wheatgrass intercropping land, and analyzed the effect of wheatsweet clover, wheatwild pea, wheatpea, wheatmaize, wheathairy vetch intercropping on soil organic matter, alkalisoluble N and available P. The result showed that the treatments of wheatgrass intercropping increased soil organic matter, alkalisoluble N and available P. Wheatsweet clover and wheatwild pea intercropping increased alkalisoluble N 4.8 mg/kg(19.4%) and soil organic matter 0.39 g/kg(1.6%)，respectively. Wheatwild pea intercropping also increased 8 mg/kg(23.9%) available P. The contents of soil organic matter, alkalisoluble N and available P reduced with the increasing soil depth.