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The present study was conducted at the demonstration farm of Massaed Technology Transfer Center, Gezira State, during 2016/2017, to evaluate the effect of combine harvester forward and reel speed on wheat harvesting losses (total header, processing and total machine losses). Three combine harvester forward speeds (4, 5 and 6 km/h), and three reel speeds (25, 35 and 45 rpm) were used in the experiment, which was arranged in a split plot design with three replications. The results showed that forward speed 4 km/h with reel speed 25 rpm recorded the lowest total header losses (31.8 kg/ha) while the highest losses (90.1 kg/ha) was recorded by the forward speed 6 km/h and reel seed 25 rpm. The lowest processing losses was obtained from the forward speed 6 km/h with reel speed 25 rpm (13.2 kg/ha) while the highest was recorded by the forward speed 4 km/h with the reel speed 45 rpm (38.2 kg/ha). Forward speed 4 km/h with reel speed 25 rpm recorded the lowest total machine losses (56.7 kg/ha) which represents 9.5% of the total yield as compared to 118.0 kg/ha which represents 19.67% of the total yield recorded by the same speed with 45 rpm reel speed. It was concluded that the forward speed 4 km/h with reel speed 25 rpm was appropriate for reducing combined wheat harvesting losses under Gezira Scheme conditions.

Influence of Combine Harvester Forward and Reel Speeds on Wheat Harvesting Losses in Gezira Scheme (Sudan)