Update on Bio-Char / Terra Prieta soil improvement method

http://onlinelibrary.wiley.com/wol1/doi/10.1002/fee.1226/full
My comment: "...converts nutrient-poor rainforest soil into fertile farmland" (from link)...

Unfortunately this usually results in loss of rainforest and production of extremely poor variety of cultivated crops, many of which are inedible.

Rainforests are extremely efficient nutrient recycling systems, most nutrients are above one's head.


Rainforest soils tend to be very poor, most of the minerals are in the plants, not underground.


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https://archaeologynewsnetwork.blogspot.com/2016/06/700-year-old-fertile-soil-technique.html#29dHO2t2ghQJAPvF.97