Dear Frank
I understand that the silica is what makes rice do so much better - after all, it needs silica in exactly that form to grow the fastest. You points about the composition of the char are important - particularly if stoves are supposed to produce something useful. Is there any good reason to suppose that putting the whole mass, the whole biomass, into the soil, perhaps chipped or ground up? Why would charring it first do anything except speed up access to ash? Regards Crispin
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