TY JOUR TI THE INFLUENCE OF THE TRACTOR DRAW BAR CLASS ON THE ENERGY CONSUMPTION LOSS SIZE FROM SOIL COMPACTION KW tractor KW draw bar class KW energy expenses KW soil compaction KW crop capacity KW compaction area JO Bulletin of KSAU AU Schitov, S.V. AU Spiridanchuk, N.V. AU Kuzin, V.F. PY 2013 IS PB Krasnoyarsk State Agrarian University