Abstract
Among all the food grains, basmati rice (Oryza sativa) has tremendous export potential. The basmati rice cultivar is very sensitive to mechanical abuses. The commercially available machines for paddy harvesting and threshing are not suitable for basmati varieties because of relatively delicate nature. There is an opinion regarding the performance of the axial flow machines that the breakage of grain is less than that of cross-flow machine. To know the exact status of grain breakage and other losses for basmati rice cultivar, a tangential axial flow (TAF) threshing cylinder was compared with fully axial flow cylinder for threshing basmati rice. The total grain loss in fully axial threshing cylinder was less as compared to TAF threshing cylinder. Grain breakage was also less in axial flow cylinder as compared to TAF cylinder. Threshing efficiency of TAF system was less as majority of the threshing takes place in first portion of the cylinder where threshing action is of cross-flow type. Cleaning efficiency was more in TAF cylinder compared to the axial flow cylinder. This may be due to higher separation length in the case of TAF cylinder.
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