大豆、花生根瘤菌肥是一种细菌肥料.当大豆、花生种子发芽后,根瘤菌即侵入豆科作物的根系细胞,逐渐形成一个个的根瘤,其中生长着千万个根瘤菌,它们能大量地固定空气中植物不能直接利用的氮素,供应植物生长需要.同时,根瘤菌也从植物体内吸取它们生长所需要的各种养分.根瘤菌和豆科作物的这种关系,叫作共生固氮关系. Soybeans and peanuts Rhizobium is a kind of bacterial fertilizer.When soybean and peanut seeds germinate, Rhizobium invades the root cells of leguminous crops and gradually forms nodules one by one, in which tens of millions of rhizobia grow, Nitrogen that plants can not directly use in the air fixes the need for plant growth and at the same time rhizobia pick up the nutrients they need for their growth.The relationship between rhizobia and leguminous crops is called symbiotic nitrogen fixation relationship.