Volume 12, Issue 44 (summer 2008)
jwss 2008, 12(44): 223-231 |
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Askari Asli Ardeh E, Sabori S, Alizadeh M R. Effect of Drum Speed and Moisture of Crop on Threshing Losses and Waste in Rice Common Varieties. jwss 2008; 12 (44) :223-231
URL: http://jstnar.iut.ac.ir/article-1-881-en.html
URL: http://jstnar.iut.ac.ir/article-1-881-en.html
Abstract: (19559 Views)
A considerable portion of threshing losses and waste of rice takes place in threshing stage. One of the effective factors in threshing losses and waste of threshing units, threshers and harvesting machines, is the drum speed. In this research, effects of three factors including drum speed (five levels), crop moisture content (two levels) and rice common varieties (four varieties) on threshing losses and waste were studied. The thresher T25 was used for the investigation. It has wire loop type tooth. Dependent factors included unthreshed grains percentage (threshing losses) and damaged grains percentage. The obtained data was analyzed by split–split plot test based on Complete Randomized Blocks Design. The mean values were compared using Duncan’s Multiple Range Test. The tests results revealed that significant effect of variety type and drum linear speed on threshing losses (P<0.01). Furthermore, the effects of variety type, moisture content and drum speed on damaged grains were also significant. The optimum drum speed was 14 m/s. The most and the least of threshing losses belong to Hashemy and Binam varieties, respectively. Among the tested varieties, Binam variety showed the highest percentage of the damaged grains. In general, decreasing the crop moisture resulted in increasing the mean damaged grain.
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