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在大豆和小麦的根际土壤中，其根瘤菌数量变化范围在每克土壤３个以上到５万个以下；大豆根际土壤中根瘤菌数量大大超过小麦根际土壤中的数量，最大可超过１万倍。在第二年的风干土样中，不同土类中大豆根瘤菌数量在０—５００个／克干土；草甸土、暗棕壤、黑土中的根瘤菌数量高于白浆土；在从未种过大豆的林地土壤中也分离到了根瘤菌。从栽培大豆根瘤中分离出的根瘤菌与栽培大豆结瘤好于野生大豆
In rhizosphere soil of soybean and wheat, the number of rhizobia varied from more than 3 to less than 50,000 per gram of soil. The rhizobium amount in soya rhizosphere soil greatly exceeded the amount in wheat rhizosphere so that the maximum could exceed 10,000 times. In the second year of air-dried soil samples, the number of soybean rhizobia in different soils ranged from 0 to 500 / g dry soil; the number of rhizobia in meadow soil, dark brown soil and black soil was higher than that of white soil; Rhizobium was also isolated from woodland soils not planted with soybeans. Rhizobia isolated from cultivated soybean nodules and cultivated soybean nodulated better than wild soybean