Suitable sowing rate of green manure for replanting oilseed rape under different tillage patterns after wheat in the Yellow River tank farm area of Inner Mongolia

• LIU Chen, 
• WANG Weini, 
• LIAO Shipeng, 
• REN Tao, 
• GUO Chen, 
• XU Yuanyuan, 
• YU Daohai, 
• LIU Junmei, 
• ZHANG Haoqiang, 
• SUN Xia, 
• LU Jianwei