TY JOUR TI RESULTS OF RESEARCH OF CYLINDER-SPIRAL SOIL-TILLING ROLLER KW soil density KW cylindrical spiral roller KW spiral KW coefficient of compliance with the standard. JO Vestnik of Kazan State Agrarian University AU Sharonov, I.A. AU Kurdyumov, V.I. AU Proshkin, V.E. PY 2018 IS 13 PB Kazan state agrarian University