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Variations of biological properties (3, 30, 90 days) of chernozem under the impact of antibiotics (ampicillin, streptomycin, tylosin) and pesticides (systemic fungicide input) in the concentration of 500 mg/kg of soil have been studied in simulation experiments. Addition of biocides varies the enumeration of microorganisms and enzymatic activity of soils. Correlation analysis revealed positive interrelation between enzymes of the two considered classes (dehydrogenase, invertase) with enumeration of micromycetes (r...