Knowledge of the physical and mechanical properties of the rice grain is being used in the handling, planting, harvesting, threshing, cleaning, size grading, up grading, treating and packaging. Several physical properties of three rough rice cultivars (Poya, Khazar and Haraz) were determined and compared in terms of length, width, thickness, aspect ratio, arithmetic diameter, geometric diameter, equivalent diameter, sphericity, mass, volume, surface area, bulk density, true density and porosity. A linear model for describing the mass of rough rice grain for each cultivar was also investigated.

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