Estimation the soil ecological functions sustainability to antibiotic pollution

In the laboratory model studies, the sustainability of ecological functions of ordinary chernozem to pollution by antibiotics was examined based on the integral indicator of soil biological state (IIBS). The negative effect of ordinary chernozem pollution by antibiotics on the change in basic biological indices, indicating a violation of the soil ecological functions (decrease IIBS by 10-25% of the control). The degree of influence of antibiotics is determined by their nature and timing of exposure. Bactericidal antibiotics have the greatest inhibitory effect on the studied parameters, than bacteriostatic. By the degree of inhibition the biological parameters, antibiotics form the following series: ampicillin ≥ streptomycin> tylosin> tromexin> alizeryl. The most informative of studied biological parameters is the number of ammonifying bacteria and the activity of dehydrogenases. The least informative is catalase activity. The abundance of bacteria Azotobacter in case of contamination with antibiotics is not informative. The maximum exposure to antibiotics is manifested in the first period after the contamination of chernozem (3 days). On subsequent terms (30, 90 days) there is a tendency to restore biological indicators. However, complete restoration of biological properties (up to control values) is not observed and on 90 days after contamination.