TY JOUR TI PRODUCTIVITY AND QUALITY OF WINTER WHEAT VARIETY GRAIN IN CONDITIONSOF MIDDLE VOLGA REGION STEPPE KW winter KW variety KW yield KW protein KW gluten KW vitreousness KW nature JO Bulletin Samara State Agricultural Academy AU Maslova, G.Y. AU Lavrennikova, O.A. PY 2016 IS 1 PB Samara State Agrarian University