A biological activity of preparations on the basis of biohumus was tested on early potato of Zhukovskii variety. The vermicompost, a product of vital functions of earthworms of Vladimirskii hybrid Staratel’ elite commercial line, was used as a source for bioactive preparations. The biologically active substances from vermicompost were isolated by alkaline extraction. The extracts of biohumus active substance in concentration of 1.5½10 -2 %, 1.5½10 -3 % and 1.5½10 -4 % were used for presowing treatment of tubers in complex with foliar treatment at the different vegetation periods. It was shown, that the treatment of sowing material and the spraying of plants by solution of biohumus active substance in concentration of 1.5½10 -4 % have a positive effect on development of plants and increases the potato productivity by 38 %. In addition, the resistance of early potato of Zhukovskii variety to bacterial rot, late blight of potato and vascular wilt during storage was shown to be increased under the influence of biohumus preparation.
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