Effect of mineral and biological fertilizers on the formation of the microbiota of the root zone of the developed top-type peat bog under the planting of large-fruited cranberry plants in the conditions of Belarus

The results of a comparative study are presented on the influence of the mineral Basacot Plus 6 (N15P8K12 kg/ha a. i.) and domestic biological fertilizers ‒ nitrogen-fixing and phosphate-mobilizing microbial MaKloR in 5 and 10 % concentrations, as well as organo-mineral Ecohum complex on the microbiological properties of the substrate under plantings of virginal and generative plants of early-ripening Ben Lear and late-ripening Stevens varieties of large-fruited cranberries in the experimental culture in the recultivated areas of top-type peat excavation in identical experiments in the Smolevichi district of the Minsk region, geographically distant 250 km from each other and in the more northern Dokshitsy district of the Vitebsk region. It has been established that fertilizers have a predominantly inhibitory effect on the totality of the main characteristics of the microbiota under plantings of an early-ripening variety and, on the contrary, a stimulating effect under those of a lateripening variety. Under plantings of an early ripening variety in the Smolevichi district, regardless of the age of plants, the most significant deterioration in the state of microbial cenoses was found when applying mineral fertilizer and treating with the Ecohum complex, and in the Dokshitsy district ‒ when using MaKloR, especially in a 5 % concentration. Under plantings of a late-ripening cranberry variety in the both areas under study, the tested fertilizers, on the contrary, contributed to the predominant activation of microbiological processes in the rhizogenesis zone. At the same time, in the Smolevichi district, regardless of the age of plants, the greatest stimulating effect on them was the application of mineral fertilizer, as well as the use of Ecohum complex on virginal plants and 5 % MaKloR on generative ones. As we moved north, there was a noticeable increase in the positive effect of the tested fertilizers on the formation and functioning of the microbiota of the root zone of the late-ripening cranberry variety, the greatest efficiency of using exclusively biological fertilizers, especially bacterial MaCloR in a 10 % concentration on virgin plants and 5 % on generative ones.