Effects of Mixed Sowing of Chinese Milk Vetch (Astragalus sinicus L.) and Rape on Rice Yield and Soil Physical and Chemical Properties

In order to explore the effects of Chinese milk vetch and rape mixed sowing on rice yield soil fertility, select best planting mode, five different ratios were designed study yield, physicochemical properties fertility in 0-10 cm, 10- 20 cm 20-30 layers. Grey correlation analysis nutrient was carried out by using grey system theory. The influence layers chemical greater than physical properties. effect shallow is that deep soil. Mixed improved comprehensive all layers, highest 2M2R treatment. pH value had greatest actual followed available potassium. Therefore, could significantly increase early content, pattern “1/2 +1/2 rape-early rice-late rice” effect.