Dynamics of the quantity of agronomically valuable groups of microorganisms during cultivation of maize on sod-podzolic sandy loam soil

The influence of biofertilizers (Polyfunkur and Agromik) on agronomically valuable groups of microorganisms on sod-podzolic sandy loam soil is considered in order to determine their amount depending on the phases of maize development. Methods: phenological, agrochemical, microbiological. Study was carried out on sod-podzolic sandy loamy soil. The amount of bacteria in both fertilized test and the control was almost the same in the Polifunkur test during the tillering phase. The amount of autochthonous oligotrophs in the control was 1.5 times higher than in Polyfunkur test. The amount of the other seven agronomically valuable groups prevailed in Polyfunkur. In the Agromik test, the total amount of eight of nine agronomically valuable groups was higher than in the control. During the beginning of flowering and the cob-forming phase, the amount of agronomically valuable groups of microorganisms was higher in the fertilized soil than in the control.