Abstract.
The application of heavy rates of mineral fertilizers due to the lack of organic substances suppresses the development of important soil microorganisms. It also causes a shift in the balance of microbiological pools. Management of soil fertility processes involves the applying of such fertilizers, which ensure the dominance of agronomically valuable groups of microorganisms. During the production and application of bio-fertilizers increases a number of problems. One of these is the impact of terms of bio-fertilizer application into the soil under conditions of active solar radiation. This influences on bio-fertilizer effectiveness. The purpose of the research is to study the influence of different solar radiation terms on microorganisms number of bio-fertilizer «Azoter SC», applied into the soil. The research was conducted on a soil mass of chernozem podzolized, treated with the bio-fertilizer "Azoter SC" with following insolation. The soil samples were influenced by direct insolation for 30 minutes, 1 and 2 hours. The control sample was treated with bio-fertilizer, but was not exposed to solar radiation. The results obtained confirmed bactericidal influence of insolation on microorganisms of bio-fertilizer «Azoter SC». As a result of 2 hours natural solar radiation in open soil Azotobacter chroococcum quantity decreased on 58 %, Azospirillum brasiliense and Bacillus megatherium – on 65.4 % and 71.1 % respectively. Conclusions. From the agronomic and economic point of view, the results of our research confirm the need to take into account the meteorological conditions and methods of earning the seeds treated with the bio-fertilizer as well as during simple bio-fertilizer applying into the soil. These should be provided in order to avoid bactericidal effects of direct sunlight on the components of the bio-fertilizer "Azoter SC", and therefore on its efficiency.
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