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

The paper considers the effect of biofertilizers (PolyFunKur and Agromik) on agronomically valuable groups of microorganisms in order to determine their quantity depending on the phenophases of maize. Methods: phenological, agrochemical, microbiological. Studies were carried out on sod-podzolic light-clay soil. The studies of the quantity of agronomically valuable groups of microorganisms with PolyFunKur in the tillering phase revealed that eight of nine groups had increased their quantity from 0.3 to 1.8 times over the control; only cellulose-destroying aerobic microorganisms had decreased their quantity in 3.5 times under the control. Most of groups of microorganisms increased their quantity over the control in case of Agromik as well. The total amount of microorganisms assimilating mineral nitrogen was almost equal in both tests. As in the tillering phase, in the beginning of flowering phase eight of nine groups had increased their quantity over the control in case PolyFunKur test. In case of Agromik, the quantity of micromycetes and spore ammonifiers in the control was higher while the quantity of cellulose-destroying aerobic bacteria was almost the same in the tillering phase; and was higher by more than 27 times than in PolyFunKur test in the beginning of flowering phase. The quantity of all the studied agronomically valuable groups of microorganisms in PolyFunKur test was higher than in the control and in the Agromik test in the cob-forming phase.