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Layer thickness while Sun drying

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1. Rice millers invariably use concrete floors for drying. Such drying results in sun-cracks and contamination on quality of rice is little realised as much of the milling is in hullers which by themselves contribute to breakage.

2. In case of sun drying the produce is spread on hard floor or threshing yard around 10-cm thickness, and is allowed to dry by heat from the Sun.

3. Spread the grains in thin layers, ideally 2-4 cm.

4. If layers are too thick a large moisture gradient develops with dry grains on the top and wet grains on the bottom, which re-adsorbs moisture after mixing, thus resulting in cracked grains. 

File Courtesy: 
http://www.ikisan.com/CropSpecific/Eng/links/ap_riceDrying.shtml
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