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Phosphorus in soils from plantation of red pine ( Pinus resinosa Ait.) was determined using six extractants: 0.002 N H 2 SO 4 (pH 3.0); 0.025 N HCl+ +0.03 N NH 4 F; 0.5 N NaHCO 3 (pH 8.5); N NH 4 OAc (pH 4.8); anion exchange resin (Dower −2, Cl-form); H 2 O. Correlations of extractable P with Al- and Al-+Fe-P indicated that these fractions are the dominant forms of inorganic P in most of the soils

Evaluation of phosphorus in forest soils: Comparison of phosphorus uptake, extraction method and soil properties