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Sorption capacity of phosphate in mineral soils ii. dependence of sorption capacity on soil properties



Sorption capacity of phosphate in mineral soils ii. dependence of sorption capacity on soil properties



Journal of Agricultural Science in Finland 62(1): 9-16



The dependence of the indicator of phosphate sorption capacity on extractable Al and Fe and other soil properties was studied in a material consisting of 102 mineral soil samples. The sum of P adsorbed on soil during two days from a solution containing P 5 mmol/l and P extracted by 0.02 M EDTA (pH 5.3) as an estimate of the initial P content in the soil was used as the indicator of P sorption capacity. In clay and silt soils (n = 51), the Al and Fe extracted by 0.05 M oxalate (pH 2.9) together with the organic C content explained 85%, the Al and Fe extracted by 0,05 M K4P2O7 (pH 10) together with the clay content 87%, the Al and Fe extracted by 0.02 M EDTA (pH 5.3) 91%, and the Al extracted by 1 M CH3COONH4 (pH 4.8) together with the organic C and clay contents 78% of the variation of the indicator of phosphate sorption capacity. In coarse soils (n = 51), the variation of the indicator was explained well only by oxalate-extractable metals, which together with soil pH and clay content explained 80% of the variation. Extractable Al was generally the most important explainer of variation. The results suggest that forms of extractable Al and Fe explaining the variation of the indicator of P sorption capacity in clay and silt soils are partially different from those in coarse soils.

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