3.1. Properties of cavitated charcoal and soils
The cavitated charcoal (CHAR-C) used in the study had an alkaline pH and
high electrical conductivity (EC). The content of macronutrients, e.g.,
calcium and potassium, varied in the studied material (Table 1). The
content of heavy metals was lower than that observed in biochar produced
from plant biomass (Gondek et al., 2017). The LS and C soils used in the
study had different granulometric compositions and chemical properties
(Table 2). Both soils were characterised by the natural content of heavy
metals examined in this study.