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Falling rate period

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1. As time passes, it takes more time for internal moisture to appear at the surface, and evaporation of water is no longer constant in time.

2. As a result, drying rate will decline, and some of the heat from the drying air will heat up the grain. 

3. For paddy grain, the falling-rate period typically occurs at around 18% grain moisture content.

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