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Abstract

Use of modern technologies in agricultural operations, especially in harvesting equipment for grain crops, has created a huge scientific breakthrough in reducing crop loss and increasing some properties.Experiment was conducted in one of the fields of Al-Shtrah 2022.This research studied Performance efficiency, total losses, loss threshing unit, and the amount of stalks scattered behind the harvester.The best Indicator involved three levels of harvester speeds (2.50, 3.05, 4.50 km.h -1 ), and levels of clearance between cylinder and concave (12, 15, 20) mm.Factorial Experiments under (RCPD) with three replications was used in the study.It was verified the superiority harvester speed 4.50 km.h -1 gets the highest performance efficiency 95% and less loss threshing unit 79%, while the speed 2.50 km.hr -1 gets less total losses 1.83% and loss threshing unit 1.24 kg.dunam -1 , clearance cylinder and concave 12 mm gets the lowest percentage of total losses 2.41%, losses threshing unit 79%.