TY JOUR TI SUBSTANTIATION AND RESULTS OF PRACTICAL RESEARCHES OF THE PLOUGH FOR DIGGING POTATOES IN WET WEATHER CONDITIONS KW plow KW potato KW soil moisture KW soil hardness KW conical body KW hog board KW volumetric crushing coefficient JO Vestnik of Kazan State Agrarian University AU Smirnov, P.A. AU Pushkarenko, N.N. AU Smirnov, M.P. AU Alekseev, E.P. PY 2020 IS 14 PB Kazan state agrarian University