الفهرس 
Seed size and shapeOnly 14 pages are availabe for public view
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Abstract
Mechanical harvesting is considered as one of most operations affecting grain losses. Losses almost always take a great toll of the potentially available. supply because of poor harvesting and processing techniques. Modification and improvements in coinbine mechanisms and parts are required to increase coinbine capacity and improve overall efficiency of the machine. Grain losses in a coinbine cleaning mechanism have been, identified as a major factor limiting coinbine efficiency and capacity. The laboratory perfonnance of cleaning ~nechanisin (aeromecllanical separating unit) of the Japanese type combine harvester was experimentally investigated for wheat grains (Sakha 69 variety). The objective of the present study are: 1) To develop a laboratory experimental unit for separating and cleaning wheat grains based on the aero~necl~anicaplr operties of the wheat chaff mixture. 2) To study some physical and aerodynamic properties of the wheatchaff mixture produced froin the coinbine harvester. 3) To study and analyze of some factors affecting the separation and cleanliness efficiency by using the laboratory experimental unit. 4) To specify the optimum conditions of cleanliness operation which ensure the maxiinum grade of separation efficiency with lniniinum gram losses.