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Key terms: soil charcoal terra preta carbon wood matter nutrients et al mg zn mn biomass zinc phosphorus calcium formation nitrogen biochar glaser amazonian portuguese terra preta soils manganese aromatic tropical quantities indigenous black carbon dark earths fertility nucleus agricultural availability amazon basin proportion biological wood charcoal pedology bacteria retention particles infertile microbial carboxylic absorption characterized low temperature soil improvement university of kansas formation of terra preta Search external links cited by footnotes on Wikipedia page Terra preta: |
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