The term 𝐹 is the organic carbon content of the biochar and corresponds to the carbon removed from the atmosphere by the plants and later separated in the pyrolysis process; for the particular batch used here, 𝐹 0.74. This is close to the mean value of 0.81±0.07 for wood biomass pyrolyzed at high temperatures (>600°C) reported in . A similar range (0.7-0.85) was also reported in .