The common sense for rice husk ash producing is the more active ash the more efficient reaction, so almost all the experiments for soil improvement were implemented with the ash which is supposed to be active by burning at an appropriate temperature and duration. However, exothermic property of the burning rice husk makes the inner temperature of the burning mass uncontrollable. Consequently the quality of the rice husk ash can be largely various even the burning condition is set up at the optimum, accordingly the overall positive effect of the additives might come not only from the good quality of the ash. There was also research about soil improvement effect with uncontrolled burnt ash and it also showed a good result.
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