The increase in the use of chemicals and simplification in crop rotation significantly reduce the soil productive potential. The number of microorganisms in soil decomposing organic residues, recreating humus, and maintaining correct soil structure, decreases. The soil structure improvement and its fertility are ensured by use of soil improvers. The POLSIL BIOPREPARATY offer includes the MG Mikroorganizmy Glebowe (Soil Microogranisms), a modern microbiological formulation setting new standards for soil improvers