Phosphorus sorption maxima and desorbability in selected soils with andic properties from the Azores, Portugal

The values of Pm were positively correlated with Ald, Alo, allophane, Feo, Fed and Alp contents, and with the values of Alo + 1/2 Feo. In contrast, values of Pdes were negatively correlated with these soil constituents. Of the six extractants, the B2 extractant showed generally higher proportions of Prec than the other extractants in most studied soils. The proportions of Prec by the B2, M3, ER and OL extractants were negatively correlated with contents of Feo, Fed, Ald, Alo, Alp, and Fep, and with the values of Alo + 1/2 Feo and PR.