Unverified50% confidenceFactExact time
Modern soil science research has found that the carbon content of Amazonian Dark Earth is more than 70 times that of surrounding natural soils, its phosphorus content is hundreds of times higher, and its fertility can persist for thousands of years without human maintenance.
1
Sources
50%
Confidence
Long-term
Relevance
8/9/2026
First Seen
Sources
亚马逊失落文明：3%雨林面积曾养活300万人口
Related Claims
UnverifiedWood chips have a carbon-to-nitrogen ratio of approximately 400:1 to 500:1, making them a high carbon-to-nitrogen ratio organic material.68% similarUnverifiedMature temperate forests deliver 40–80 kg/hectare of nitrogen and approximately 5–10 kg/hectare of phosphorus to the soil annually through the litter layer.66% similarUnverifiedThe total area of Amazonian Dark Earth plots discovered to date is estimated to be between 6,000 and 18,000 square kilometers, with some plots exceeding two meters in depth.62% similar
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