particularly effective as “environmental friendly” fertilizers, since
they allow not only to reduce the use of chemicals, but also to
re-use agro-industrial wastes and organic residues which gave an
“adding value” to these novel organo-mineral formulates. At the
end, since the reported experience is related to a medium-term
period, it should be considered the potential “residual” Fe that the
proposed mixtures could supply to plant on long term: this aspect
needs to be further investigated.