INFLUENCE OF FERTILIZATION SYSTEMS AND MICROBIAL PREPARATIONS OF THE FORMATION OF NUTRIENT STATUS OF SOD-PODZOLIC SOIL

Abstract

Objective. To study the influence of systematic introduction of mineral, traditional organomineral and alternative systems of fertilization and inoculation of seeds on the formation of the nutrient status of sod-podzolic soil. Methods. Field experiment, agrochemical, balance and settlement, statistical. Results. Based on the studies conducted in a long-term stationary experiment on sod-podzolic soil, a significant influence of the studied fertilization systems in combination with microbial preparations on the soil nutrient status was established. The highest levels of mineral compounds of nitrogen, mobile phosphorus and exchangeable potassium using crop rotation were observed upon long-term use of the organomineral fertilization system NPK + animal manure + + green manure. At the end of the crop rotation, the content of nitrogen mineral compounds increased by 23 %, phosphorus — by 8 % and potassium — by 34 % on the background without inoculation and by 34 %, 10 % and 34 %, respectively, on the background of inoculation compared to traditional fertilization system NPK + animal manure. Due to the use of microbial preparations under this fertilization system, the content of nitrogen in the arable layer of the soil increased by 7 %, mobile phosphorus — by 3 % and exchangeable potassium — by 6 % compared to their content at the beginning of crop rotation. It has been proved that the highest level of crop rotation productivity in terms of feed units was provided by the organomineral fertilization system green manure + animal manure + NPK, which exceeded crop rotation productivity in areas under the traditional fertilization system NPK + animal manure by 21 % on the background without inoculation and by 26 % on the background of inoculation. Due to the use of microbial preparations, there is an increase in crop rotation productivity by 10–13 %. Conclusion. The optimal nutrient status of sod-podzolic soil is formed using microbial preparations and an organomineral fertilization system based on organic fertilizers in the form of animal manure with an average crop rotation dose of 10 t/ha and legume green manure on the background of mineral fertilizers N60P50K60. This fertilization system provides recovery of soil fertility, high rates of economic and energy efficiency of growing crops and their productivity during crop rotation.