TY JOUR TI EFFECT OF VARIETY AND PLANTING DENSITY ON THE YIELD FORMATION OF POTATOES KW JO Vestnik biotechnology AU Tyutenov, E.S. AU Mingalev, S.K. AU Chulkova, V.A. AU Saparklycheva, S.E. PY 2018 IS 2018 PB Ural State Agrarian University