and may be responsible for the
promising effects observed when organic material is used for the mitigation
of inorganic-contaminated soil (Kumpiene et al., 2008). Other
studies have demonstrated that peat and a concentrate containing
humic substances from coal favor mustard development in contaminated
soil due to the mitigation of Zn, Cu, Mn, Pb and B by the organic
ligands (Santos and Rodella, 2007).