Sulfate desorption from representative soils of the São Paulo State, Brazil
M. E. Alves A and A. Lavorenti B CA Departamento de Física e Informática, Instituto de Física de São Carlos—IFSC/USP, Caixa Postal 369, 13560-970 São Carlos (SP), Brazil.
B Departamento de Ciências Exatas, Escola Superior de Agricultura ‘Luiz de Queiroz’—ESALQ/USP, Caixa Postal 09, 13419-980 Piracicaba (SP), Brazil.
C Corresponding author. Email: alavoren@esalq.usp.br
Australian Journal of Soil Research 44(3) 291-297 https://doi.org/10.1071/SR05134
Submitted: 12 September 2005 Accepted: 22 February 2006 Published: 5 May 2006
Abstract
We determined the sulfate desorption in representative soils of the São Paulo State, Brazil, and related it to the soil affinity for sulfate ions as estimated by the parameters kL and nF of the Langmuir and Freundlich equations, respectively. Although the parameters kL and nF were well correlated, the nonlinear decay of the sulfate desorption with the increase in the soil affinity by sulfate was better defined when the affinity was estimated by the parameter kL. Despite this, results of multiple regression linear analyses carried out for both kL and nF were quite similar and allowed us to verify that sulfate desorption tends to increase in subsurface soil layers as they become less acidic and/or have their phosphate-extractable sulfur contents increased trough successive fertilisations and/or amendments with S-containing products. At the same time, sulfate desorption in these soils tends to be restrained by the advance of weathering.
Additional keywords: sulfate adsorption sites, Langmuir and Freundlich equations, tropical soils.
Acknowledgment
We thank FAPESP for the financial support to this research (Grant 98/01502-8).
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