Lucia Helena Garófalo Chaves - D epartment of Agricultural Engineering, Federal University of Campina Grande,Av. Aprigio Veloso, ۸۸۲, Campina Grande, Paraiba State, Brazil
Vinícius Batista Campos - Federal Institute of Amapa, Av. Tancredo Neves, ۲.۹۶۵,Campus Laranjal do Jari, Macapá, Amapá State, Brazil
Mônica Shirley da S. Sousa - D epartment of Agricultural Engineering, Federal University of Campina Grande,Av. Aprigio Veloso, ۸۸۲, Campina Grande, Paraiba State, Brazil
D oroteu Honório Guedes Filho - D epartment of Agricultural Engineering, Federal University of Campina Grande,Av. Aprigio Veloso, ۸۸۲, Campina Grande, Paraiba State, Brazil

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 CampinaGrande, 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. Thisisotherm 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.

Langmuir; Isotherm; Tropical soils