5. Conclusion

Phosphorus adsorption in soils account for the low P availability for plant uptake.

The Langmuir, Freundlich and Temkin equations are common models for describing P sorption when input data are limited.

The review indicated that, in acid soils amorphous Al and Fe oxides compounds are the important factors that determine the soils' capacity to retain P.

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For strongly weathered soils enriched in Fe and Al oxides, with different degree of ordering, a model that is able to account for the different oxide fractions and which can be used to predict the adsorption P capacity of these soils is the pedotransfer model of Borggard et al. [7].

However in alkaline soils, calcium carbonate may determine the amount of P sorbed by the soils.
