Effect of exogenous hormone IAA or 6-BA combined with nitrogen on the above-ground growth and physiological characteristics of Elymus sibiricus

• JIN Xin, 
• QI Juan, 
• LIU Wenhui, 
• WU Zhaolin, 
• ZHENG Yuying, 
• YANG Hang, 
• SU Jinglong, 
• LI Ming