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Table 1. Basic properties of the selected soil samples.
OM, organic matter content; M3Ca and M3P, Mehlich III–extractable calcium and phosphorus; Pt, soil total phosphorus determined after digestion with concentrated H2SO4 + H2O2 as in the last step of the fractionation; Alox and Feox, ammonium oxalate–extractable aluminum and iron; Fedc, dithionite + citrate–extractable iron.
TH, Typic Humaquepts; AH, Aeric Humaquepts.
Table 2. Sequential P fractionation of the soil samples ± standard deviations.
Pi, inorganic phosphorus; Po, organic phosphorus; Pt, total phosphorus; resin P, the most available inorganic phosphorus; NaHCO3–P, labile phosphorus sorbed on the soil surface; NaOH-P, phosphorus chemisorbed to aluminum or iron; HCl-P, apatite-type minerals; H2SO4–P, chemically stable organic phosphorus and relatively insoluble inorganic phosphorus.
The numbers in parentheses are the percentage of each fraction relative to the sum of all fractions.
Table 3. Phosphorus K-XANES (X-ray absorption near-edge structure) fitting results showing the relative proportion (percentage, normalized to sum = 100) of each phosphate standard that yielded the best fit to the soil XANES data in linear combination fitting.
Total PO4 on Fe- or Al-oxide is the sum of PO4 adsorbed on ferrihydrite, goethite, Al hydroxide, or alumina. Total Ca phosphate is the sum of hydroxyapatite and octacalcium phosphate.
Percent of total P after normalization to sum = 100% ± computed standard errors for the linear coefficients.
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