Pilot study on the two-stage or combination drying of high moisture paddy in the humid tropics [Philippines]
1987
Tumambing, J.A. | Bulaong, M.C. (National Post-harvest Inst. for Research and Extension, Munoz, Nueva Ecija (Philippines))
A pilot plant drying experiment on two-stage or combination drying was conducted in the dry and wet seasons in Isabela, Philippines to demonstrate safe drying techniques and to develop and test improved drying strategies for high moisture paddy under humid tropical conditions. Results of the experiment showed that two-stage drying is as highly feasible drying strategy in terms of technical efficiency, cost effectiveness and product quality. The drying strategy found suitable for the dry season was intermittent drying in storage for moisture content levels of 18%-20%. For the wet season, high moisture grains (with moisture content above 26%) had to be dried quickly in the high speed dryer to about 18% in the first stage. This stage was followed by slow drying in storage to 14% using supplementally heated air. Energy costs were substantially less than that of conventionally heated air dryers. The quality of dried samples did not differ significantly from that of naturally dried control samples. Head rice reached as high as 69.4%. There was no yellow rice and no visible mold growth. The germination rate was 99%. Further investigations are required for the first stage of drying and application of the two-stage drying strategy to other crops like maize and peanuts.
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