The combine harvesters pick, thresh and separate grain from MOG (material other than grain) regardless the grain quality and losses. The grain damage is a threat for safe production whilst grain losses impair the rural development and sustainable agriculture. The objective of this study was to evaluate the work quality of the mechanized wheat harvesting in Kurdistan province and develop its result to Iran. The shattering losses and the visible broken grain for the two conventional types of combine harvesters were studied. The amounts of harvested broken grain were measured more than 9.3%. The shattering losses on ground were exceeds from 99 kg/ha.
