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Phosphate Sorption in Relation to Extractable Iron and Aluminum in Spodosols

Department of Soil Science, Univ. of British Columbia, Vancouver, BC, Canada V6T 1Z4

*Corresponding author.

ABSTRACT

Phosphorus is an important plant nutrient and of concern from the environmental point of view. Numerous studies on the relationship between P sorption characteristics and other soil properties have been done; however, most of these studies do not include originally sorbed (oxalate-extractable) P (P_o). Since P_o accounts for 17 to 66% of the total sorption capacity (P_o + X_m, where X_m is the P sorption maximum) in 43 Spodosol samples from British Columbia, Canada, it should not be ignored in P sorption models. The good correlations between oxalate-extractable Fe and Al (Fe_o + Al_o) and P sorption parameters (P_o, X_m, or P_o + X_m) indicate amorphous Fe and Al oxides are the major P sorbents in the soils studied. Phosphorus sorption capacity is predictable from Al_o and Fe_o by two existing models. The relationship between organically complexed Al and P sorption parameters may be important in forest and soil management, since the organically complexed fraction is relatively easily altered if environmental factors or management practices change.

Received for publication May 31, 1993.

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