The article presents the results of studying the influence of chemical and biological seed treatment pesticides on the composition of the rhizosphere microbiome of sugar corn during its growing season.It was shown that the using of chemicals reduces the number of ammonifiers and microscopic fungi in the rhizosphere of plants in the first half of the growing season. The effect of xenobiotics on the content of actinomycetes, oligonitrophils and pedotorophs was less toxic. The content of these microorganisms was decreased by 50-75% in comparison with the control, with changes in the quantity and assortment of the rhizosphere microflora. At the same time, the studied pesticides did not affect the content of oligotrophs.As the plants developed, the negative effects of chemical pesticides on the soil microflora gradually leveled off. The composition of rhizosphere microflora in each conditional functional group of microorganisms was restored, and before the end of the maize vegetation, the natural microbial content returned to its original quantitative and qualitative composition.The use of microbiological seed treatment pesticides did not lead to changes in the number of soil microorganisms or its imbalance of composition. The quantitative and qualitative composition was coincided to the control
maize rhizosphere, microorganisms, pesticides, biologicals products