The goal of the study was the search for biological preparations having diverse influence on the growth and development of soybean plants of variety Garmoniya compatible with the collection strains of rhizobia of the species Bradyrhizobiumjaponicum (Jordan, 1982), Sino-rhizobiumfredii (Scholla, Elkan, 1984), Bradyrhizobi-umelkanii (Kuykendalletal., 1992) of the Amur selection. The research tasks were to study the resistance of rhi-zobia strains to biological preparations used for pre-sowing seed treatment, the assessment of the effect of being studied preparations on the growth and develop-ment of soybean variety Garmoniya, virulence of pure cultures of rhizobia. Microbiological and biological methods were used in the research. Laboratory experi-ments were conducted at the All-Russian Scientific Re-search Institute of Soybean (FSBSI “All-Russian SRI of Soybean”, Blagoveshchensk). As a result of the study of plant preparations (on the basis of natural extracts, de-rived from Dahurian larch) - EcoLarix, Arabinogalactan, Dihydroquercetin (DQС), Premix, Extractor - it was found out that only the properties of strain, regardless of tested preparations, had an influence on the intensity of growth of the collection pure cultures of rhizobia. The safest concentration of Dihydroquercetin used together with the strains of rhizobia was 0.1 g/l. With its increase up to 5.0 g/l in the medium, most strains of rhizobia sharply decreased the intensity of growth, and 5 strains (Вр-12, Вр-16, Вр-17, FZ-27, ОМ-41) stopped growing. The strains of rhizobia TM-469 и TB-643 were the most resistant to high concentration of Dihydroquercetin (5.0 g/l) in the medium. When applying the being studied preparations in the nutrient medium for plants at con-centrations of 0.01 and 0.001 % in variants without in-oculation of seeds, the length of stem increased by an average of 24 %, the increase in roots mass and above-ground part of soybean - by 20-22 %. In the variants with inoculation of seeds by the strain 648a, the prepa-rations increased the length of soybean stem by aver-age of 37 %. 100 % virulence of the strain 648a has been preserved in the variants with Dihydroquercetin, EcoLarix, Extrakor, and the slowdown of formation of nodules on the soybean roots with Arabinogalactan and Premix has been marked.
rhizobium, strains, species, preparations (EcoLarix, Arabinogalactan, Dihydroquercetin, Premix, Extrakor), soybean
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