Evaluation of mixed sowing methods for oats and vetch under drip irrigation in arid areas of Ningxia

• WANG Bin, 
• LI Manyou, 
• LI Xiaoyun, 
• CAO Lijuan, 
• SHEN Xiaotian, 
• LAN Jian, 
• DONG Xiu, 
• GAO Junrong