The preparation is a biological inoculant containing Bradyrhizobium japonicum and Rhizobium leguminosarum bacteria in amounts of 50±20% each. It also contains macro- and microelements, as well as biologically active products of bacterial metabolism: vitamins, heteroauxins, gibberellins, and others. The preparation is intended for use in agriculture, especially for soybean planting. Application of the preparation increases crop yields by activating bacterial infection, which helps plants better absorb nutrients from the soil. The preparation can be used both on an industrial scale and for retail sale to the public.