TY JOUR TI SUBSTANTIATION OF THE FORM AND DETERMINATION OF THE CONSTRUCTIVE PARAMETERS OF THE ROTATION ROLLER OF SOIL KW rotary ripper KW soil KW teeth KW spiral-plate working unit. JO Vestnik of Kazan State Agrarian University AU Bulgariev, G.G. AU Pikmullin, G.V. AU Galiev, I.G. AU Sitdikov, F.F. AU Begaliev, B.S. PY 2018 IS 13 PB Kazan state agrarian University