The work was performed in the municipal district of Cachoeiras de Macacu, Rio de Janeiro State and had as objective to obtain information on the contents of chemical forms of Cu, Cr, Mn, Ni, Pb and Zn in soil Gleissolo pouco húmico treated with composted urban residues, and the concentrations in the leaves and fruits of guava (Psidium guajava L.). Three areas with different land use history were used: area that received doses of 40 t.ha¹ of composted of urban solid residue (CRSU) in the surface for eleven consecutive years; area with only one application of CRSU in the hole; and control area, with no guava and no CRSU. The soil samples were taken from each area, in the layers of 05, 515 and 15-30 cm. The sequential extraction of metals from the earth samples demonstrated a widespread tendency of reduction in the mobile or more bioavailable forms of heavy metals in the soil with the use of CRSU. There was increase in the heavy metals contents in the leaves and fruits of guava cultivated in areas that received CRSU. However, these contents were within the normal range for economic crops. There is a need for monitoring total metal contents, in soils and plants, due to their increment in soils treated with CRSU.
heavy metals; municipal solid waste compost; guava (Psidium guajava L.)
