Abstract
Among the main processes of soil degradation is the depletion of organic carbon in the soil. Increasing soil fertility can reduce the risks of soil degradation and improve the environment. This article presents the results of a study of the biological properties of ordinary Chernozem and the yield of oilseed flax when applying the preparation «Agrobions» and mineral fertilizers. Field experiments were conducted on the experimental field Of the training and research and production center «Elite» of the Kokshetau state University named after sh.Ualikhanov. The microbiological activity of the soil was determined by the method of flax seed applicationand the microflora was taken into account by seeding the soil suspension on solid nutrient media. The effect of the preparation «Agrobions» in combination with mineral fertilizers on the composition of microflora, microbiological activity of common black soil and the yield of oilseed flax seeds was established. The preparation of «Agrobionov» in combination with mineral fertilizers had a positive effect on the number of agronomically valuable groups of microorganisms and on the yield of oilseed flax.