%0 Journal Article %T RESULTS OF FIELD STUDIES OF SOIL-TILLAGE TOOLS WITH ELLIPSOVID DISKS %A Yarullin , F.. %A Ibyatov, R.. %A Yakhin, S.M. %A Gaynutdinov, R.H. %K tillage, elliptical disks, rotary tool, ridging, soil crumbling, depth of processing %J Vestnik of Kazan State Agrarian University %D 2019 %N 14 %P 4 %I Kazan state agrarian University