TY JOUR TI SELECTION OF MEDIUM EARLY AND MID-SEASON VARIETIES OF POTATOES FOR THE STEPPE ZONE OF SOUTHERN URALS KW grade KW potato starch KW productivity KW marketability KW tuber JO Bulletin Samara State Agricultural Academy AU Mushinskiy, A.A. AU Aminova, E.V. AU Gerasimova, E.V. PY 2016 IS 1 PB Samara State Agrarian University