生物固氮对于自然界氮素的循环起着重要作用.农作物所需要的大部分氮素要依靠生物固氮供给,而根瘤菌固氮约占整个生物固氮的33～55%.我省早在解放初期就开始使用根瘤菌肥料,一般增产1成左右.1978年以来,我所引进美国及国内各省大豆、花生根瘤菌株30多个,分别在 Biological nitrogen fixation plays an important role in the circulation of nitrogen in nature, most of the nitrogen needed by crops depends on the supply of biological nitrogen fixation, while rhizobium nitrogen fixation accounts for about 33 ~ 55% of the total biological nitrogen fixation. The use of rhizobium fertilizer, the general increase of about 1 percent since 1978, I have introduced the United States and the domestic provinces provinces soybean, peanut rhizobia strain more than 30, respectively, at