Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Fractionation of Zn, Cd and Pb in a Tropical Soil After Nine-Year Sewage Sludge Applications

Full text
Author(s):
Nogueira, T. A. R. [1] ; Melo, W. J. [2] ; Fonseca, I. M. [2] ; Marcussi, S. A. [2] ; Melo, G. M. P. [2] ; Marques, M. Q. [2]
Total Authors: 6
Affiliation:
[1] Univ Sao Paulo, Ctr Nucl Energy Agr, Dept Plant Nutr, BR-13400970 Piracicaba, SP - Brazil
[2] Sao Paulo State Univ, Dept Technol, BR-14884900 Jaboticabal, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: Pedosphere; v. 20, n. 5, p. 545-556, OCT 2010.
Web of Science Citations: 26
Abstract

A long-term field experiment was carried out in the experiment farm of the Sao Paulo State University, Brazil, to evaluate the phytoavailability of Zn, Cd and Pb in a Typic Eutrorthox soil treated with sewage sludge for nine consecutive years, using the sequential extraction and organic matter fractionation methods. During 2005-2006, maize (Zea mays L.) was used as test plants and the experimental design was in randomized complete blocks with four treatments and five replicates. The treatments consisted of four sewage sludge rates (in a dry basis): 0.0 (control, with mineral fertilization), 45.0, 90.0 and 127.5 t ha(-1), annually for nine years. Before maize sowing, the sewage sludge was manually applied to the soil and incorporated at 10 cm depth. Soil samples (0-20 cm layer) for Zn, Cd and Pb analysis were collected 60 days after sowing. The successive applications of sewage sludge to the soil did not affect heavy metal (Cd and Pb) fractions in the soil, with exception of Zn fractions. The Zn, Cd and Pb distributions in the soil were strongly associated with humin and residual fractions, which are characterized by stable chemical bonds. Zinc, Cd and Pb in the soil showed low phytoavailability after nine-year successive applications of sewage sludge to the soil. (AU)