title: Concentration of Cu, Zn, Cr, Ni, Cd, and Pb in soil, sugarcane leaf and juice: residual effect of sewage sludge and organic compost application.
abstract: Many researchers have evaluated the effects of successive applications of sewage sludge (SS) on soil plant-systems, but most have not taken into account the residual effect of organic matter remaining from prior applications. Furthermore, few studies have been carried out to compare the effects of the agricultural use of SS and sewage sludge compost (SSC). Therefore, we evaluated the residual effect of SS and SSC on the heavy metal concentrations in soil and in sugarcane (Saccharum spp.) leaves and juice. The field experiment was established after the second harvesting of unburned sugarcane, when the organic materials were applied. The SS and SSC rates were (t ha(-1), dry base): 0, 12.5, 25, and 50; and 0, 21, 42, and 84, respectively. All element concentrations in the soil were below the standards established by São Paulo State environmental legislation. SS promoted small increases in Zn concentrations in soil and Cu concentrations in leaves. However, all heavy metals concentrations in the leaves were lower than the limits established for toxic elements and were in accordance with the limits established for micronutrients. There were reductions in the concentrations of Ni and Cu in soil and the concentration of Pb in juice, with increasing rates of SSC. The heavy metal concentrations were very low in the juice. Under humid tropical conditions and with short-term use, SS and SSC containing low heavy metal concentrations did not have negative effects on plants and soil.
authors.affiliation: University of São Paulo (USP), Center for Nuclear Energy in Agriculture (CENA), Av. Centenário, 303, 13400-970, Piracicaba, São Paulo, Brazil. sarahmello@hotmail.com.
authors.forename: Sarah Mello Leite
authors.initials: SM
authors.lastname: Moretti
authors.affiliation: São Paulo's Agency for Agribusiness Technology (APTA), Secretariat of Agriculture and Food Supply of São Paulo State, Rod. SP 127, km 30, PO 28, Piracicaba, São Paulo, Brazil.
authors.forename: Edna Ivani
authors.initials: EI
authors.lastname: Bertoncini
authors.affiliation: São Paulo's Agency for Agribusiness Technology (APTA), Secretariat of Agriculture and Food Supply of São Paulo State, Rod. SP 127, km 30, PO 28, Piracicaba, São Paulo, Brazil.
authors.forename: André César
authors.initials: AC
authors.lastname: Vitti
authors.affiliation: University of São Paulo (USP), College of Agriculture Luiz de Queiroz (ESALQ), Av. Padua Dias, 11, 13418-260, Piracicaba, São Paulo, Brazil.
authors.forename: Luís Reynaldo Ferracciú
authors.initials: LR
authors.lastname: Alleoni
authors.affiliation: University of São Paulo (USP), Center for Nuclear Energy in Agriculture (CENA), Av. Centenário, 303, 13400-970, Piracicaba, São Paulo, Brazil.
authors.forename: Cassio Hamilton
authors.initials: CH
authors.lastname: Abreu-Junior
mesh_terms: D000383:Agriculture; D004784:Environmental Monitoring; D019216:Metals, Heavy / Q000032:analysis*; D018977:Micronutrients / Q000032:analysis; D018515:Plant Leaves / Q000737:chemistry; D031786:Saccharum / Q000737:chemistry*; D012722:Sewage / Q000032:analysis; D012987:Soil / Q000737:chemistry*; D012989:Soil Pollutants / Q000032:analysis; D014865:Waste Disposal, Fluid; D015032:Zinc / Q000032:analysis
chemical_list: D019216:Metals, Heavy; D018977:Micronutrients; D012722:Sewage; D012987:Soil; D012989:Soil Pollutants; D015032:Zinc
keywords: Composting; Heavy metals; Sanitary sludge; Soil contamination