Title of article :
Phosphate Sorption in Oxisols in Paraíba State, Brazil, Classified as Solution Equilibrium Phosphorus
Author/Authors :
Helena Garófalo Chaves, Lucia D epartment of Agricultural Engineering - Federal University of Campina Grande - Av. Aprigio Veloso - 882 - Campina Grande - Paraiba State, Brazil , Batista Campos, Vinícius Federal Institute of Amapa - Av. Tancredo Neves - 2.965 - Campus Laranjal do Jari - Macapá - Amapá State, Brazil , Shirley da S. Sousa, Mônica D epartment of Agricultural Engineering - Federal University of Campina Grande - Av. Aprigio Veloso - 882 - Campina Grande - Paraiba State, Brazil , Honório Guedes Filho, D oroteu D epartment of Agricultural Engineering - Federal University of Campina Grande - Av. Aprigio Veloso - 882 - Campina Grande - Paraiba State, Brazil , Alexandra Estrela, Maria D epartment of Agricultural Engineering - Federal University of Campina Grande - Av. Aprigio Veloso - 882 - Campina Grande - Paraiba State, Brazil , David de Barros, Adilson D epartment of Agricultural Engineering - Federal University of Campina Grande - Av. Aprigio Veloso - 882 - Campina Grande - Paraiba State, Brazil
Abstract :
Aiming to evaluate the phosphorus adsorption in Oxisols with phosphorus remaining classified using the Langmuir isotherm, a study was developed in the laboratory at Federal University of Campina Grande, PB, with samples of the surface layer (0-20 cm) of three Oxisols of the State of Paraíba, differentiating among these the classification of the remaining P-values. The phosphorus levels for adjusting the isotherm were defined based on the remaining P-values. To assess the maximum P adsorption capacity data from P adsorbed and equilibrium concentrations of the solutions were adjusted Langmuir isotherm. This isotherm model could satisfactorily describe the adsorption of phosphorus in soils. The Oxisol sample with high P-rem was the highest value of maximum P adsorption capacity. The maximum P adsorption capacity
was correlated with CEC and Ki for the samples classified as P-rem medium and high, respectively.
