Biochar is just charcoal made from biomass—which is plant material and agricultural waste—hence the name biochar. It is a fine-grained charcoal produced from pyrolysis: the slow burning of organic matter in a low- or no-oxygen environment. What differentiates biochar from charcoal is its purpose; it is produced as an additive to soils, mainly to improve nutrient retention and carbon storage. Although the history of biochar extends thousands of years, its science is still relatively poorly understood.
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