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on the method of manufacture of charcoal. He reported densely populated regions extending hundreds of kilometers along the river, suggesting population levels exceeding even those of today. "Charcoal as a habitat for microbes and its effect on the microbial community of the underlying humus". Schiermeier, Quirin (August 2006). "Biodegradation of two commercial herbicides (Gramoxone and Matancha) by the bacteria Pseudomonas putida ". "Amounts, Dynamics and Sequestering of Carbon in Tropical and Subtropical Soils". 52 This as an essential element in the generation of terra preta, associated with agronomic knowledge involving layering the charcoal in thin regular layers favorable to its burying. Anthropogenic roots edit Soils with elevated charcoal content and a common presence of pottery remains can accrete accidentally near living quarters as residues from food preparation, cooking fires, animal and fish bones, broken pottery, etc., accumulated.

Conference of Latin Americanist Geographers. 57 Perhaps the most important and unique part of the improvement of soil fertility is carbon, thought to have been gradually incorporated 4 to 10 thousand years ago. Archived from the original on Retrieved "Terra Preta Home Page". Kim, Sunghwan; Kaplan, Louis.; Benner, Ronald; Hatcher, Patrick. Retrieved Liang, Biqing; Lehmann, Johannes; Solomon, Dawit; Kinyangi, J; Grossman, Julie; B, ONeill; JO, Skjemstad; Thies, Janice; FJ, Luizo (1 September 2006). A b Zech,.; Haumaier,.; Hempfling,. Plant and Soil (249 343357. "Weed composition and cover after three years of soil fertility management in the central Brazilian Amazon: Compost, fertilizer, manure and charcoal applications". Compost and Biomass of aquatic plants (e.g. A b Lehmann, m " Site Terra Preta de ndio - Soil Biogeochemistry Cornell University. Institut de Sciences des Sols, University of Bayreuth.