Illienko V. Transformation of the physic-chemical state of radionuclides in soil and their uptake to agricultural crops under the impact of complex bacterial preparations

Complex researches on the impact of soil rhizospheric microorganisms to the transition of 137Cs and 90Sr in agricultural crops were conducted and the possibility of using this method to reduce the accumulation of radionuclides in the green mass of plants was assessed. For the first time the investigation of the impact of seed inoculation by soil microorganisms strains Azotobacter chroococcum UCM B-6082, Azotobacter chroococcum UCM B-6003, Bacillus megaterium UCM B-5724, Agrobacterium radiobacter IMV B-7246 and Rhizobium leguminosarum bv. viceae as monoculture and complex preparations to morphometric, growth rates and the accumulation of 137Cs in rapeseed, vetch and wheat plants, that were grown in field and laboratory. The study of the influence of seed inoculation by Azotobacter chroococcum UCM B-6082 strain on morphometric, growth rates and the accumulation of 90Sr by rapeseed, vetch and wheat plants in field were conducted. It was demonstrated that studied microbial strains has no influence on physic-chemical forms of the radionuclides in soil, but only indirectly affect the transition of radioactive isotopes in soil-plant system. The regularities of studied strains interaction with plants under different growing conditions, on an inert medium, sterilized sodpodzolic, peat bog, a typical black earth and in the field on sodpodzolic soil were determined. According to the results of field experiment we demonstrated statistically significant decrease of 137Cs and 90Sr TF after the seed inoculation by complex preparation of A. chroococcum UKM B-6082 + R. leguminosarum strains. According to the research results the seed processing with bacterial fertilizers, based on strain A. chroococcum UCM B-6082 can be recommended as an additional measure to reduce the accumulation of 137Cs and 90Sr in plants.