%0 Journal Article %T Biologized crop rotation – the main factor for fertility increases of sod-podzolic soils and arable land productivity in the Upper Volga %A Esedullaev, S.T. %A Meltsaev, I.G. %K biologized crop rotation, leguminous grasses, saturation, sod-podzolic soil, fertility, productivity, fertilizers. %J Agrarian Bulletin of the %D 2019 %N 190 %P 8 %I Ural State Agrarian University