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https://www.researchgate.net/publication/226004390_The_Microbial_World_of_Terra_Preta
These terra preta soils grow cash crops three times faster on this land compared to the surrounding soil.
The fertile terra preta of the central Amazon are anthropogenic dark earths, in a landscape characterized by soils of generally low fertility.
Archaeological evidence and carbon dating indicates that these soils were created over a period of millennia from about 9000 ybp.
https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/terra-preta
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