Paddy drying systems
Importance of drying the paddy correctly
Rice is usually harvested at grain moisture content (MC) between 24 and 26% (wet basis). Any delays in drying, incomplete drying, or uneven drying will result in qualitative and quantitative losses during:
Some recommendations on drying the paddy
Methods of drying the paddy
A. Sundrying - Sun drying continues to be the preferred drying method in Asia because of its low cost. However, it is labor intensive and control of grain temperature is difficult.
For optimum quality:
B. In-store drying - Paddy with MC below 18% can be slowly dried in storage bins using aeration with slightly pre-heated air (3−6K above ambient temperature).
Farm to commercial level, capacity depends on storage structure.
Drying time: days to weeks
Heated Air Drying
C. Fixed Bed Batch Dryer - for farmers, contractors, small rice mills. Capacity: 1−10 t/batch. Drying time: 6−8 h
D. Re-circulating Batch Dryer - for rice mills and cooperatives. Capacity: 4−10 t/batch. Drying time: 6−8 h.
E. Continuous Flow Dryer - for large commercial facilities. Capacity: ~10 t/hour. Drying rate: 1−2% pass
Prepared by M Gummert with input from JF Rickman (2004), updated by M Gummert (2011)