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LOSSES OF MECHANICAL HARVESTING OF BREAD WHEAT IN IRAQ | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 39, Issue 4, 2008, Pages 98-104 | ||
| Author | ||
| Ali S. Al-Najar | ||
| Abstract | ||
| The research was a field data of 1992 season, determining the percentage of losses in harvesting the wheat variety maxibac by the combine harvestor.Combine harvester consists of three main units cutting, threshing and screening. The data collected from Mousel, Khalis and Kut.The results were analyzed statically using the randomized complete block design with three replications was used. It is found out that there were high losses of wheat in the screening unit of combine harvester compared with the rate of standard losses allowance. The highest average of wheat loss in Khalis 238 grainm2 .The loss happen when using height speed for the screen unite Due to suffocate for the screen by straw, as well as the air speed towards the screen, Therefore we advice to adjust the speed of air and screen. In order to, decrease both the loss of grain and suffocate the screen by straw. The cutting unit losses were within the standard allowance, but in the threshing unit there were a little more losses of wheat than the standard losses allowance. The highest average of grain loss was 72 grainm2 in Mousel because the big clearance between threshing drums and concave. That’s come from bad adjustment for the clearance or the wear of a rasp bar. That allowed passing spikes without threshing. Therefore to avoid that problem we advance the users of combine harvestor adjust the clearance between the threshing drum and concave as well as replace the wear rasp bar in order to decrease the grain loss to standard allowance. | ||
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