TY JOUR TI INFLUENCE OF POLLUTION OF GRAY FOREST SOIL BY OIL ON SPRING BARLEY PRODUCTIVITY AND COEFFICIENTS OF USE OF NUTRIENT SUBSTANCES FROM SOIL KW oil KW gray forest soil KW prescription of pollution KW spring barley KW productivity KW utilization of nutrients from the soil JO Vestnik of Kazan State Agrarian University AU Osipova, R.A. AU Gilyazov, M.. AU Galavetdinov, S.M. PY 2020 IS 14 PB Kazan state agrarian University