Chemical and physical properties of biochar.
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Property Range found in literature1 Median value from literature
Total phosphorus (% dry wt) 0.3
Total nitrogen (% dry wt) 0.5
Total potassium (% dry wt) 0.4
Total carbon (%)
Total hydrogen (%)
Total oxygen (%)
pH 5.1
Cation exchange capacity (cmol/kg)
Surface area (m2/g
Electrical conductivity (ds/m) 0.80
Pore volume (cm3/g)
Total calciium (%)
Total magnesium (%)
Total copper (%)
Total zinc (%)
Total aluminum (%)
Total iron (%)
Total manganese (%)
Total sulfur (%)
Water holding capacity 52-69

Primary references for this data:

  • Cresswell

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