Nice summary thanks
Can anyone get a copy of the book "Amazonian Dark Earths" By Lehman et al Then we could check some of these facts that pop up in some web sites.
I saw the book on Amazon at about $200. they had asecond hand copy for sale too. (Lehman probably makes his students buy it)
Not the sort of thing my local council library will have
I was interested in the rainwater thing too.
The website I read said terra preta collected minerals from the rain.
Rain does dissolve some nitrogen from the atmosphere as it falls (I was told).
That is why your lawn greens up after rain.
--
Michael