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Abstract

Aims of this research was to reducing Losses in wheat crop which is considered essential criterion for evaluating the performance of the grain harvester.Cylinder speeds, clearance sieves on evaluating the performance of the new Holland combine harvester.Broken seeds, material other than grain (MOG) and grains behind the combine were studied in this research.The treatment included threshing cylinder speeds (7.00, 8.00, 9.00 rpm), and clearance of sieves with three levels (7, 9, 11) mm.The Spilt plot design with three replications was used in the research.Results showed that the cylinder speed 7.00 rpm gets the les broken seeds which amounted 2.02% and les grains behind combine (3.48) kg.donm -1 , the cylinder speed 900 rpm gets the les MOG 0.76% and the clearance sieves 7 mmm gets les broken seeds (2.71%), clearance sieves 11 mm gets les MOG amounted 0.70% and the grains behind combine which amounted (2.74) kg.daom -1 .