THE INFLUENCE OF ENVIRONMENTAL CONDITIONS TO JOB INDICA-TORS MID CONDUCTIVITY GRAIN HARVESTERS

Abstract

This  paper  examines  the  influence  of  environmental  conditions  to  mid-conductivity  combine  harvester  straw  separation  and  cleaning  grain  losses,  dam-age,  fuel  consumption  and  work  efficiency.  It  was  established  that  the  maximum feed  rate  is  limited  by  grain  losses  and  engine  power  and  working  efficiency  is limited  by  environmental  conditions.  When  harvesting  grain  which  is  very  moist (grain  moisture  18.8%),  the  feed  rate  should  be  4  kg s-1 lower  compared  with  an average  moisture  content  of  wheat  harvesting.  The feed  rate  is rational  when  fuel consumption for tone thresh grain is no longer decreasing and grain losses is below allowable limit of 0.5%. There were used 0.75 liters more fuel for tone thresh grain when  harvesting  moist  and  lodge  wheat  compared  with  an  average  moisture  con-tent  of  wheat  harvesting.  To  harvest  a  hectare  of  summer  wheat,  when  straws  are shredded and spread on stubble, used 16.2±0.12 l fuel, and when laying the wind-row used 2.53 l less fuel. Combine harvester cut down 0.46 hectares per hour and thrashed  4.3  tonnes  less  grain  when  harvesting  moist  and  lodge  wheat  compared with an average moisture content of wheat harvesting.