Symbiotic interaction between a mixture of Bradyrhizobium japonicum strains and different soybean cultivars

Aim. To study the mutual relations between different soybean cultivars and two Bradyrhizobium japonicum strains after mixed inoculation, to evaluate impact of introduced microorganisms on local rhizobial communities in soil, formation functioning symbiotic systems, productivity soybean. Methods. Microbiological serological methods; field experiment, gas chromatography mathematical-statistical methods. Results. A small- plot experiment demonstrated that use a mixture B. 46 КВ11 pro- moted more even distribution rhizobia nodule populations 12 geographic origin. There was no domination particular nodules, systems formed were balanced than control without inoculation. After inoculation above-mentioned mixture, most there considerable increase number nodules (10–45 % more) their mass (11–86 increase). also an level nitrogen fixation with 1.2–4.2 times weight grain per plant by 6–29 (depending cultivar). The efficiency preparation Rizogumin confirmed extensive trials area about 60 thousand ha regions Ukraine. In background nodulating bacteria areas, application formulated ensured stable 15–33 yield as compared Conclusions. novel approach investigated, which lies (genetic group USDA 6) japoni- cum 123) for Combining these introduction into agrocenoses (without clear domina- tion some nodules). This expressed intensified nodulation, fixation, increased soybeans inoculation).