ADSORÇÃO DE FÓSFORO EM MATERIAIS DE LATOSSOLO E ARGISSOLO

Lúcia Helena Garófalo Chaves; Iêde de Brito Chaves; Jacqueline da Silva Mendes

ADSORÇÃO DE FÓSFORO EM MATERIAIS DE LATOSSOLO E ARGISSOLO

2007

Lúcia Helena Garófalo Chaves | Iêde de Brito Chaves | Jacqueline da Silva Mendes

The objective of this paper was to determine the phosphorus adsorption characteristics using the Langmuir isotherm. The study was carried out in the Laboratório de Irrigação e Salinidade, of Universidade Federal de Campina Grande, PB, Brazil, with surface (0-20 cm) samples from two soils of Paraiba State. The soil samples (2,5 g) were mixed with a CaCl2 0.01M (25 mL), with addition to 0; 35; 45; 55; 70; 85 and 100 mg L-1 of P as KH2PO4 and maintained in contact for 24 hours. The phosphorus was analyzed from the supernatant in order to determine the amount of P adsorbed by the soils. The maximum P adsorption capacity (MPAC) was determined for all soil through the linear model of the Langmuir equation. The Ultisol showed the highest values of the MPAC and PmCF and the Oxisol showed the highest adsorption energy. The results showed that the soil attributes that had influenced on soil MPAC were soil organic matter and clay content and the base saturation.

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