TY JOUR TI DEVELOPMENT OF THE METHOD OF OPERATIONAL EVALUATION OF THE WINTER CROPS CONDITION IN THE EARLY CURRENT PERIOD WITH THE APPLICATION OF UNMANNED AERIAL VEHICLES KW aerial photographs KW crop management KW winter wheat KW multispectral data KW scoring KW crop condition KW unmanned aerial vehicle. JO Vestnik of Kazan State Agrarian University AU Loginov, N.A. AU Sabirzyanov, A.. PY 2018 IS 13 PB Kazan state agrarian University