In order to design Agro-processing machine effectively, the study of the physical and mechanical properties of seed and grain is essential for optimal machine design, selection, and operation. In this study, some physical and mechanical properties of five cowpea (Vigna unguiculata) varieties- IT 716, Sokoto Red (SR), Ife Brown (IB), White (WH), and Oloka were determined in ten (10) replicates. The results obtained were subjected to analysis of variance revealing significant differences in all the various properties tested except for the coefficient of friction on plywood, for which the mean values were 0.3978, 0.3972, 0.39806, 0.402, and 0.38194 for IT 716, IB, SR, WH and Oloka respectively. Based on these results, the varieties considered can still be treated under the same condition in mechanical handling. Inferences and recommendation were made for efficient mechanical processing of cowpea.
Key words: Cowpea, physical properties, mechanical, varieties differences.
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