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In the course of model experiments, the biological properties of ordinary chernozem at oil pollution of 5% and 10% of soil mass and subsequent introduction of biologically active substances such as urea and potassium humate were studied. The results of bioremediation of oil-contaminated chernozem on the 30th, 60th and 90th day have been assessed by its biological properties: the activity of the phosphatase, catalase and invertase, emission of carbon dioxide. The phosphatase and catalase activity have shown the mos...