TY JOUR TI THE DECREASE OF THE TRACTOR WHEEL INFLUENCE ON THE SOIL KW wheel KW pressure in wheel tires KW wheel pressure on soil KW contact area KW wheel load KW regularities JO Bulletin of KSAU AU Zyryanov, A.P. AU Pyatayev, M.V. AU Kuznetsov, N.A. PY 2014 IS PB Krasnoyarsk State Agrarian University