TY JOUR TI MICROBIOLOGICAL PREPARATIONS AND CONVENIENT-STIMULATING COMPOSITIONS IN THE TECHNOLOGY OF PERENNIAL GRASSES CULTIVATION WITH THE CONTENT OF RYEGRASS ON GRAY FOREST SOIL OF THE FOREST-STEPPE OF MIDDLE VOLGA KW meadow clover KW ryegrass multi-hulled KW nitrogen-phosphorus and potassium fertilizers KW green mass KW productivity KW the amount of sugars KW digestible protein. JO Vestnik of Kazan State Agrarian University AU Khismatullin, M.. AU Safiollin, F.N. PY 2018 IS 12 PB Kazan state agrarian University