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Re: Terra Preta soils
[QUOTE=Turtle]yes. I don't have any knowledge on whether Amazonians purposefully manufactured activated charcoal.
More cavities=better in terms of how long the adsorption continues without further application of charcoal.
It seems Amazonians made these soils purposefully; so they must also have made the charchol. Aparently there is evidence that the charchol has been deliberatly ground down into fine particles before adding to the soil. The soil is definately a man-made artifact that at one time supported a huge population.
The soils seem to last a long time.
Some modern Amazonians sell Terra praeta soils to other farmers. They say this is fine because their Terra praeta soil "grows back" !
Michael
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