TY JOUR TI STRUCTURAL PERFECTION OF AGRICULTURAL CROPS ACCOMMODATION IN EXTREME CONDITIONS OF ARID TERRITORIES IN THE SOUTH OF MIDDLE SIBERIA KW agricultural species KW agricultural and ecological conditions KW zone KW soil KW accommodation KW Middle Siberia JO Bulletin of KSAU AU Chebochakov, E.Y. PY 2012 IS PB Krasnoyarsk State Agrarian University