- UK Biochar Research Centre

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Charcoal, biochar and char are different names used to describe the same substance, depending on its end use; the term biochar was
coined by Dr Peter Read of Massey University, (New Zealand) in attempt to differentiate it thusly. The terms charcoal and char imply use as
a fuel, whereas biochar implies an application to soil.
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Examples include sewage and municipal solid waste treatment, papermill waste and animal manures
No information exists in the literature concerning the invention date of biochar-producing stoves. Dr T.Reed invented micro-gasification
stoves using a similar principle in 1985, but ash - rather than biochar - is the by-product.
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Burnspace
Cool air is heated and
rises, drawing air through
the ventilation cone. Air
provides oxygen that
fuels the combustion of
firewood
Biomass Jacket
Ventilation Cone
Combusting firewood drives pyrolysis of
biomass in jacket. Gases released during
pyrolysis of biomass pass out into the
burnspace and are combusted
Removable Bottom
Plate
Bottom Plate Clamp (Legs)
Cool air enters burnspace but cannot
enter the biomass jacket, preserving
low oxygen conditions for pyrolysis
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Consider if a equally high surface area biochars are introduced into a sandy soil (which has low nutrient retention) and one biochar
possesses high CEC the other low. The high CEC biochar is very likely to have a beneficial effect on plant growth but the low CEC will
likely not, a fact overlooked by surface area measurements.
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Contrast: A biochar of pH 4 – we know that it is acid and therefore unsuitable for acid soils and alkaline-loving plants. A biochar of 300m2/g
S.A - we know that this is technically a high SA, but questions remain to be answered i.e is this high for biochar and importantly, what
relationship to fertility can be expected for this measurement?
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650g straw in biomass jacket
Wood shavings and straw
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