%0 Journal Article
%T Adsor  o de f¨®sforo em dez solos do Estado de Pernambuco e suas rela  es com parametros f¨ªsicos e qu¨ªmicos = Phosphorus adsorption in ten soils from Pernambuco State and its relations with physical and chemical parameters
%A Rossini Mattos Corr¨ºa
%A Cl¨ªstenes Williams Ara¨²jo do Nascimento
%A Alexandre Tavares da Rocha
%J Acta Scientiarum : Agronomy
%D 2011
%I 
%X Um experimento foi conduzido para estudar a adsor  o de f¨®sforo (P) emamostras de dez solos do Estado de Pernambuco, Nordeste do Brasil. As rela  es entre atributos f¨ªsicos e qu¨ªmicos do solo e as isotermas de adsor  o de P foram tamb¨¦m avaliadas. Os resultados mostraram que a capacidade m¨¢xima de adsor  o de fosfato (CMAP), o P-remanescente (P-rem) e a constante k de da equa  o Freundlich s o vari¨¢veis confi¨¢veis para se caracterizar a adsor  o de P pelos solos. Pela sua praticidade de determina  o, o Prem ¨¦ a vari¨¢vel mais indicada. Os parametros de adsor  o de P CMAP, P-rem e constante k de Freundlich apresentaram correla  o (p < 0,01) com os atributos qu¨ªmicos acidezpotencial (H+Al), alum¨ªnio troc¨¢vel (Al), capacidade de troca cati nica (CTC) e com os atributos f¨ªsicos teor de argila e capacidade de campo (CC). As vari¨¢veis CC, P-rem, H+Al, Al, CTC e teor de argila, entre os atributos f¨ªsicos e qu¨ªmicos avaliados, permitem para os solos estudados a estimativa do valor da CMAP. A energia de adsor  o de fosfato e a constante n da isoterma de Freundlich n o foram indicadores confi¨¢veis do poder de adsor  o de f¨®sforo dos solos. An experiment was carried out to study phosphorus (P) adsorption in ten soil samples from Pernambuco State, Northeastern Brazil. The relationship between physical and chemical soil attributes and P adsorption isotherms were also evaluated. The results showed that maximum phosphorus adsorption capacity (MPAC), remaining P (Rem-P) and the k constant of the Freundlich equation are reliable variables to characterize P adsorption by the soils. Due to its easy determination, Rem-P is the best indicated variable. The parameters of P adsorption MPAC, Rem-P and the k constant of the Freundlich equation showed correlation (p < 0.01) with the chemical attributes potential acidity (H+Al), exchangeable aluminum (Al), exchangeable cation capacity (ECC) and with the physical attributes clay and field capacity (FC). The variables FC, Rem-P, H+Al, Al, ECC and clay, among the chemical and physical attributes evaluated, allowed estimating the MPAC value on the studied soils. The P adsorption energy and the n constant of the Freundlich isotherm were not reliable indicators of the P soil adsorption power.
%K fixa  o de f¨®sforo
%K Langmuir
%K Freundlich
%K phosphorus fixation
%U http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/3129/3129