TY JOUR TI ESTIMATION AND FORECAST OF YIELD OF GRAIN CROPS IN THE TERRITORY OF VOLGOGRAD REGION DUE TO CHANGES IN ECONOMIC ACTIVITY AND GLOBAL CLIMATE CHANGE KW JO Agrarian Bulletin of the AU Turko, S.Y. AU Vlasenko, M.V. AU Trubakova, K.Y. PY 2018 IS 176 PB Ural State Agrarian University