Effects of threshing methods on seed quality of three rice varieties stored for a period of four months

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The field and laboratory work were done between June 2014 and April 2015 to evaluate the effects of different threshing methods and storage on the seed quality of three rice varieties. The field work was done in Nobewan at the Anum valley in the Ashanti region of Ghana. The area lies between latitude 6ᵒ 35‟ to 6ᵒ 54‟ north and longitude 1ᵒ 4‟ to 1ᵒ 23‟ west of the Greenwich meridian. The field was laid out using 3 x 3 Factorial in the Randomized Complete Block Design (RCBD) with three replications. The laboratory experiment was done at the seed quality control unit laboratory, Grains and Legumes Development Board Kumasi, Ghana. The experiment was conducted as factorial on the basis of completely randomized design in three replications. The treatments were variety at 3 levels (Nerica-L41, Jasmine-85 and Sikamo) and the threshing method at 3 levels (Box or bambam, Drum and Machine) and the measured seed quality parameters namely analytical purity, standard germination test and vigour tests including 1000 seed weight, seedling vigour index and conductivity test were analyzed before and after a storage period of four months. The result revealed that machine threshing recorded the highest percentage of broken grains whilst box threshing had the lowest. Moreover, Jasmine-85 threshed using machine recorded the highest germination while Sikamo threshed using machine recorded the lowest seed germination after storage. Electrical conductivity values increased after storage although the values were still within the high seed vigour bracket. However, 1000 seed weight increased after storage due to moisture absorption by the seeds during storage.
A thesis submitted to the school of research and graduate studies, Kwame Nkrumah University of Science and Technology, in partial fulfillment of the requirement for the award of Master of Philosophy (Seed Science and Technology).