This research provides further data for the long-term C storage
potential of low ash-high C and high ash-low C biochars when
applied to soils of differing mineralogy. The tomato biochar, with
high inorganic C content (18%),was less stable in the acidic soil with
a high acid buffering capacity (Ferralsol); whereas the blue mallee
biochar was more stable in this soil, probably due to the organomineral
interactions. The long-term soil C storage potential of the
blue mallee biochar is much greater than that of the tomato biochar.