The purpose. To study efficiency of joint application of strains of Bradyrhizobium japonicum with slow and intensive growth at cultivating soya bean. Methods. Microbiological, field and statistical. Results. The opportunity of use of strains of nodule bacteria of soya bean with different growth rate for increase of the yield of host plant is probed. It is determined that joint application of 2 active strains of B. japonicum is much more efficient as compared to monoinoculation. In binary compositions nodule bacteria with slow and intensive growth reinforce action of each other and promote formation of balanced symbiotic systems without sharp prevalence of separate strains in nodule populations. Conclusions. Composition of strains of B. japonicum 46 and B. japonicum KV11 which ensures stable increase of productivity of soya bean for 21,4-30,0% in comparison with control without inoculation is offered.