%0 Journal Article %T EFFICIENCY OF FIELD CROP ROTATIONS AT DIFFERENT LEVELS OF INTENSIFICATION AND BIOLOGIZATION OF AGRICULTURE %A Akhmetzyanov, M.R. %A Talanov, I.P. %K crop rotation, structural and aggregate composition of the soil, weediness, productivity, humus, energy efficiency %J Vestnik of Kazan State Agrarian University %D 2020 %N 14 %P 4 %I Kazan state agrarian University