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The influence of seed-dressings on the formation and functioning of
symbiotic soybean systems with fungicide-resistant rhizobia

. The application of bacterial fertilizers, prepared on the basis of active,
competitive strains of nitrogen-fixing microorganisms and fungicidal dressings for
pre-sowing seed treatment in soybean cultivation technologies is characterized by high
biological and economic efficiency. Therefore, it is important to find such combination
of chemicals and microbial preparations, for the complex use of which will be
maintained their main purpose. The aim of the work was to investigate the formation
and functioning of symbiotic soybean systems with fungicide-resistant nodule bacteria
Bradyrhizobium japonicum PC09 and B144 under the influence of Standak Top and
Fever seed dressings. 
Differences in the effect of chemical plant protection products on the formation
of symbiotic systems of soybean variety Almaz and nitrogen-fixing microorganisms
have been established. A decrease by 9.2‒24.1 % in the number of nodules formed on
the roots during the soybean growing season with the combined use of Fever with
rhizobia bacterization of PC09 strain was revealed. At inoculation the seed with Tn5-
mutant B144, use of the same preparation, the decrease of this indicator compared to
control plants was 6.5‒32.8 %. An increase in the weight of root nodules by 10.3‒36 %
was found under the effect of Standak Top and bacterization by both strains of rhizobia.There was a decrease in the intensity of N2 assimilation compared to control plants by 24.2 and 42.3 % in the stage of three true leaves with the combined use of Fever with inoculation and a gradual decrease of the toxic effect of pesticides on the functioning of symbiotic systems in the budding-flowering stage. At shared treatment of seeds with rhizobia strains B144 and PC09 and Standak Top revealed an increase in nitrogen
fixation intensity by 6.2‒25 % in the stage of three true leaves, 12.5‒58 % in the stage
of budding-beginning of flowering and by 28.1‒42.3 % in the stage of bean formation.
Maintaining high level of nitrogenase activity of legume-rhizobial symbiosis, formed
with the participation of pesticide-resistant nodule bacteria with using of seed
dressings, will provide plants with available forms of nitrogen, protect sown seeds from
soil and seed infections and create conditions for grain production.