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Constant rate period

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1. Once the grain is at the drying temperature, water starts to evaporate from the surface of the grain.

2.  During this period, all the heat from the drying air is used to evaporate surface moisture and the amount of moisture removed from the grain is constant in time.

3.  It is therefore called the constant-rate period. During this period, grain temperature is constant as well.

File Courtesy: 
http://www.knowledgebank.irri.org/rkb/index.php/drying-basics/the-drying-process
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