TY JOUR TI THE SUBSTANTIATION OF THE COMBINE HARVESTER USE EFFIENCY ON THE MATHEMATICAL METHOD BASIS KW ) KW combine harvester KW efficiency KW full energy consumption KW full energy consumption efficiency ratio KW mathematical model JO Bulletin of KSAU AU Tshitov, S.V. AU Evdokimov, V.G. AU Kidyaeva, N.P. PY 2013 IS PB Krasnoyarsk State Agrarian University