Effect of planting patterns on crop yield, nutrients uptake and interspecific competition in maize-soybean relay strip intercropping system Effects of long-term double-rice and green manure rotation on rice yield and soil organic matter in paddy field Stability analysis of allelopathic effects of Panax notoginseng on main crops by AMMI model Effects of different crop rotations on growth of continuous cropping sorghum and its rhizosphere soil micro-environment.