FAO - Biochar
Biochar is the carbonaceous solid product of biomass pyrolysis which can be used as chemical feedstock for various purposes such as energy production, and adsorption of pollutants. In particular, application of biochar to the soil is gaining greater interests, which can reduce fertilizer consumption, increase crop yields, and sequestrate carbon.
-- Lee, Yongwoon. Asian and Pacific Council, Food & Fertilizer Technology Center