TY JOUR TI SUBSTANTIATION OF THE OPTIMAL INCLINATION ANGLE OF ELLIPSOID DISC OF ROTATION SOIL-PROCESSING EQUIPMENT KW soil cultivation KW rotational ellipsoid disk KW the angle of the disc. JO Vestnik of Kazan State Agrarian University AU Gaynutdinov, R.H. PY 2017 IS 12 PB Kazan state agrarian University