Data/hora: 11/06/2024 13:21:44

Provedor de dados: | 63
País: | Brazil
Título: | Heavy metals in Oxisols amended with biosolids and cropped with maize in a long-term experiment
Autores: | Oliveira,Katarzyna Wójcik; Melo,Wanderley José de; Pereira,Gener Tadeu; Melo,Valéria Peruca de; Melo,Gabriel Maurício Peruca de.
Data: | 2005-08-01
Ano: | 2005
Palavras-chave: | Mehlich 1; Sewage sludge; Maize; Metal availability.
Resumo: | Biosolids comprise organic matter and plant nutrients, but are also a source of heavy metals hazardous to soils, plants and humans. The aim of this work was to evaluate accumulation, movement in the soil profile and availability to maize plants of heavy metals in two oxisols amended with biosolids for five years. The experiment was carried out in Jaboticabal, SP, Brazil, under field conditions, using a split-plot design. Biosolids were added to the soils at four different rates, 0.0 (control with mineral fertilization), 2.5; 5.0 and 10.0 t ha-1, dry weight basis, annualy for three years. In the fourth and fifth years, the 2.5 t ha-1 treatment rate was increased to 20.0 t ha-1. In the fifth year, soil samples were collected at 0-20 and 20-40 cm depths and analyzed for Cu, Ni, Mn, Pb and Zn total and extractable (Mehlich 1) contents. Biosolids increased the concentration of Ni and Zn in the Typic Eutrorthox, and of Ni, Pb, Zn and Cu in the Typic Haplorthox, but values did not exceed critical limits established by legislation. The elements generally accumulated in the 0-20 cm depth. Lead and Ni concentrations in grains were below detection limits. In general, heavy metals contents in maize plants were not affected by application of biosolids. Mehlich 1 extractant was not efficient in predicting the availability of Ni, Mn, and Pb to maize plants.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000400012
Editor: | São Paulo - Escola Superior de Agricultura "Luiz de Queiroz"
Relação: | 10.1590/S0103-90162005000400012
Formato: | text/html
Fonte: | Scientia Agricola  v.62 n.4 2005
Fonte: | info:eu-repo/semantics/openAccess