Heavy metals in the soil and castor bean plants fertilized with sewage sludge stabilized by different processes

ABSTRACT: This study evaluated the levels of heavy metals in soil and castor bean plant after fertilization with sewage sludge (SS) subjected to different stabilization processes. The was conducted a Haplic Cambisol following treatments: control (CO), solarized (SSS), composted (CSS), vermi (VSS), limed (LSS), mineral fertilizer (MF). experimental design included subdivided plot scheme being primary factor layers or leaf parts secondary factor. data obtained were analyzed using analysis variance Scott-Knott test 5% significance. Fertilization SSS, CSS, LSS led highest increase Zn soil, mainly surface layer. In tissues, Cu higher CO SSS treatments, whereas Ni level VSS, MF treatments. general, limb than petiole, Ni, Pb, Cr petiole limb. any case, no symptoms toxicity plants risk contamination observed