TY JOUR TI BARLEY PRODUCTIVITY DEPENDING ON NUTRITION BACKGROUND AND SEEDING RATE KW seeding rate KW fertilizer doses KW root rot damage KW weediness of crops KW crop quality KW productivity JO Vestnik of Kazan State Agrarian University AU Talanov, I.P. AU Karimova , L.. PY 2019 IS 14 PB Kazan state agrarian University