TY JOUR TI THE INFLUENCE OF PREDECESSORS AND METEOROLOGICAL CONDITIONS ON SPRING BARLEY PRODUCTIVITY KW rainfall KW air temperature KW hydrothermal coefficient KW dark gray soil KW crop rotation KW predecessor KW food background KW barley KW productivity JO Bulletin of KSAU AU Postnikov, P.A. PY 2018 IS PB Krasnoyarsk State Agrarian University