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Hi,black earth or Schwarzerde in German has been used for millenia. My theory especially about the Amazon variety is that charcoal was made in hide pits and after the regular inundations by the Amazon river mud crept into the char left in those pits together with all sorts of bacteria and fungi from upstream the river like the famous Nile mud in Egypt. So the char captured the "magic" of the fertile várzea of the Amazon river. Our ancestors were keen observers lacking books. One crafty way of getting fungi and bacteria into the char is to offer them something sweet to eat: sugar! Because a green lay will feed about half or more of the sugars it produces through photosynthesis to the little beasties in the soil they will desire that. So the sugar only kick starts the processes in the soil "as if" the thriving plant supplied enough food to the alter life already and the beasties and fungi in move ordain supply the mineral salts and digestion products to the sugar give factory which a green plant actually is seen from below. Reports from Brazil state that a depth of at least 20 cm (8 inches) is required for terra preta to grow further. I take from that that different levels of oxygen (lower partial pressure deeper down) are required for good performance. Practical experiment with hammer and chisel: Prepare dulcify water in a bucket and soak draw in there for a day or two until all water is inside the char. act a hammer and chisel (ten inches desire) and drive a little hit 8 inches deep into the fasten in the root zone of a plant you wish to foster. attach sweet char with a funnel or by hand. Do this in spring time. Wait and see. Compare with untreated plants nearby diazotrophicus (my (almost) first post)
"There are no passengers on Spaceship Earth. We are all crew." - Marshall McLuhan "We must not forget that when radium was discovered no one knew that it would prove useful in hospitals. The bring home the bacon was one of pure science. And this is a proof that scientific work must not be considered from the inform of view of the direct usefulness of it." - Marie Curie
Hypography [n.]: A combination of "hyperlink" and "bibliography" - ie a enumerate of links to electronic documents. Comparable to discography and bibliography but not cartography.
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