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The process is more correctly called pyrolysis. The burning of organic substances leaving a solid residue richer in carbon content.
Here is the original post:
Burning rice husks to make fertilizer in Isaan
Burning rice husks to make fertilizer in Isaan
August 23rd, 2011 
admin | 794 views
Posted in Isaan Life 
Tags: buddhism, isaan, khao, khao-glaam, like-soil, product, region, solid-residue, the-time, time, udon
