Selection and evaluation of multiple cropping oats for suitable varieties in a farming–pastoral ecotone in northern China

• YUAN Bo, 
• XU Lijun, 
• ZHAO Yaru, 
• NIE Yingying, 
• YANG Min, 
• XUE Wei, 
• WU Xinjia, 
• MENG Qingquan, 
• MENG Xianwen