The objective of this study was to evaluate the concentration of heavy metals in soil and leaves of corn fertilized with rock phosphate and sewage sludge compost. The work was conducted at the experimental area of ICA/UFMG, Montes Claros - MG, in Cambisol. The treatments, in factorial 2 x 4, corresponded to two doses of rock phosphate (0 and 90 kg P2O5 ha-1) and four doses of sewage sludge compost (0, 25, 50 and 75 Mg ha-1). The experimental design was randomized blocks with three replications of treatments. The rock phosphate did not affect overall levels of heavy metals in soil, however, Cu, Zn and Pb in soil increased with application rates of sewage sludge compost. Applications of sewage sludge compost up to 75 Mg ha-1 did not increase the concentrations of Cu, Zn, Pb, Cd, Ni and Cr above the critical limits established by legislation. In plants, the concentrations of Cu, Zn, Pb, Cd and Cr were not affected by the application of rock phosphate, however, the Zn concentration increased and Pb concentration decreased with the application rates of sewage sludge compost.
biosolids; organic fertilizer; soil pollution
