Inoculating rhizobial strain were significantly increased biomass yield and crude protein of alfalfa,but crude protein contents in whole plants was not increased obviously.

• 对植株粗蛋白含量的提高作用不大,但能有效提高紫花苜蓿的生物学产量和粗蛋白的产量;与植株根部氮含量虽有一定相关性,但相关程度不高;