Effects of Sowing Density on Yield of Dry Direct Seeding Rice under Potato-rice Rotation System

• ZHU Haiping, 
• WANG Yaowei, 
• OUYANG Yiping, 
• LI Guiyong, 
• LI Ruhui, 
• TIAN Shuling, 
• LI Bingju, 
• YANG Congdang