EN
The paper presents results of the studies dealing with evaluation of the quality of threshing of the Ajma soybean by the threshing complex of the Bizon combine harvester. The threshing process, provided various working parameters of the thresher, have been recorded on the 16 mm film using special "Hyspeed" camera operating with the speed of 500 frames per second. The best quality of threshing the soybeans (of the moisture of 14%) has been obtained at the rotational speed of the drum varying from 700 to 750 revolutions per minute, operating slot between the drum and the concave of 25/15 mm, and rotational speed of the fan in the range of 650-700 revolutions per minute.