Biochar. Biochar created through the pyrolysis process.
History[edit] Left - a nutrient-poor oxisol; right - an oxisol transformed into fertile terra preta using biochar Pre-Columbian Amazonians are believed to have used biochar to enhance soil productivity. Biochar fact sheet (Fact Sheet) Australia and New Zealand Biochar Researchers Network - Home Page. Terra Preta de Indio. Pyrolysis"