N treatments added 0, 50, 100, 200, 400 mg N pot-1. ** Shoot N2 fixed was estimated by the difference in shoot N produced by plants nodulated by strain SM-5 and the effective strain (USDA 110).

• 氮处理分别是0，50，100，200，400mgN/盆。** 茎叶固定的N2用SM-5菌株和有效菌株(USDA110)使植株结瘤而在茎叶中产生的N素差值来估算。