
Keywords: خاکستر بادی یا فلای اش; SS; sewage sludge; PR; phosphoric rock; FA; fly ash; BF; bioavailability factor; OM; organic matter; TOC; total organic carbon; EC; electrical conductivity; F1; exchangeable; F2; carbonate-bound; F3; Fe/Mn oxide-bound; F4; organic matter/sulfide-bound; F5