4. Conclusions
Cavitated charcoal has great potential to deacidify soils and increase
the C content. The application of cavitated charcoal does not increase
the total content of heavy metals; however, it substantially reduces
their mobility. The determined values of the base respiratory activity
of the soils into which CHAR-C was introduced were low, which indicates
a large number of dormant microorganisms, as confirmed by the values of
induced respiratory activity. The obtained results of DhA and Ure
activity showed the low metabolic activity of the microbial population
in the soils, especially at high rates (7.0% and 14.0%) of CHAR-C. The
cavitated charcoal dust used in the study showed high-yielding
properties, and its application significantly reduced the heavy metal
content in the biomass of Sorghum saccharatum (L.).