%0 Journal Article %T THE ARABLE LAND PRODUCTIVITY DEPENDING ON THE PRIMARY TILLAGE SYSTEM OF THE DARK-GRAY FOREST SOIL IN THE TYUMEN REGION %A Perfiliev, N.V. %A Skipin, L.N. %A Gaevaya, E.V. %K soil, resource-saving, tillage system, minimization %J Bulletin of KSAU %D 2014 %N %P 4 %I Krasnoyarsk State Agrarian University