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

摘要: Phosphorus in soils from plantation of red pine (Pinus resinosa Ait.) was determined using six extractants: 0.002N H2SO4 (pH 3.0); 0.025N HCl+ +0.03N NH4F; 0.5N NaHCO3 8.5);N NH4OAc 4.8); anion exchange resin (Dower −2, Cl-form); H2O. Correlations extractable P with Al- and Al-+Fe-P indicated that these fractions are the dominant forms inorganic most soils. Uptake by corn Monterey seedlings grown greenhouse culture correlated soil extracted different methods. The successful extractants for predicting uptake P; simple correlation coefficients were 0.811 0.609 respectively. significantly (r=0.679),N (r=0.443), H2O (r=0.549) (r=0.532) while (r=0.579), (r=0.477) organic (r=0.460). Per cent seedling tops H2SO4, andN NH4 OAc P. Multiple regressions which included silt+clay improved correlations some tests