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Besides layer depth and mixing interval the drying rate of sun drying depends on other factors which are usually out of control of the operator:
1.Temperature and humidity of ambient air: The rate at which rice dried is affected significantly by the temperature and humidity of the air which move over or through the grain.
2. For this reason, in most Tropical and Humid climates, Sun drying is only successful during a few hours in the mid-day. Initial moisture content of grain: Wet grains dry more rapidly than comparatively dry grains.
3. Air velocity: Natural convection is usually not enough to transport large amounts of evaporated moisture away from the grain.
4. Therefore, drying rates through Sun heating are higher on windy days compared to days without wind.