TY JOUR TI SEED PRODUCTION OF VARIETIES OF SPRING RAPE DEPENDING ON THE DOSES OF MINERAL FERTILIZERS IN THE CONDITIONS OF THE MIDDLE URALS KW spring rape KW mineral fertilizers KW yield KW yield structure KW oil seeds JO Vestnik of Kazan State Agrarian University AU Mokrushina, A.V. AU Bogatyreva, A.S. AU Akmanaev, E.D. PY 2019 IS 14 PB Kazan state agrarian University