TY JOUR TI THE EFFECTIVENESS OF THE WHEELED TRACTORUSEINTHE TILLAGE TECHNOLOGY KW adaptation KW material capacity KW mass KW tillagetechnology KW tractor KW energy potential KW effectiveness JO Bulletin of KSAU AU Selivanov, N.I. AU Makeeva, Y.N. PY 2015 IS PB Krasnoyarsk State Agrarian University