Abstract
This study was carried out during Agriculture season 2001-2002 to calculate quantity and quality losses of wheat by using John-Deere harvester at two sites in Nenevieh governorate. The first was in Basheka region under rain fed conditions, the second was in Talafer region under sprinkler irrigation system. The experiment was conducted according to RCBD by three factors combine ground speed, Reel speed and cylinder speed by three replications. the harvesting speed 2.5-3 km/hr with the reel speed 21 rpm with the cylinder speed 950 rpm surpassed in giving the least loss in quantity at both sites with the highest performance efficiency. The harvesting speed 3.5-4 km/hr with the reel speed 26 rpm with the cylinder speed 950 rpm surpassed in giving the least visible qualitative loss rate in Basheka region while the same ground speed and cylinder speed, but the reel speed 21 rpm surpassed in giving the least visible qualitative loss rate n Talafer region. the harvesting speed 3.5-4 km/hr with the reel speed 31 rpm with the cylinder speed 950 rpm surpassed in giving the highest seed dead rate at both sites. the losses average was about 16.5% from the total yield, and the wheat yield quantity for one Donum was 616.5 Kg/Do. It means that there is losses quantity 90.84 Kg/Do. than the international standard losses 2%.
