TY JOUR TI AGROMINERAL MICRO-FERTILIZING MIXTURE APPLICATION FOR CULTIVATION OF SUNFLOWER ON THE BASE OF CLEARFILD SYSTEM IN THE MIDDLE VOLGA FOREST-STEPPE REGION KW sunflower KW hybrid KW mix KW yield KW oil content JO Bulletin Samara State Agricultural Academy AU Vasin, V.G. AU Potapov, D.V. AU Saniev, R.N. AU Prosandeev, N.A. PY 2020 IS 5 PB Samara State Agrarian University