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Table 1 Extraction of Inorganic P from Soils*

From: Phosphorus retention in calcareous soils and the effect of organic matter on its mobility

Extractant P forms extracted
NaOH/NaCl Al- and Fe-bound
Na citrate-bicarbonate (CB) Labile pedogenic Ca-rich
Na citrate (C) Pedogenic Ca-phosphates
Na citrate-ascorbate (CA) Occluded in poorly crystalline Fe-oxides
Na citrate-bicarbonate-dithionite (CBD) Occluded in crystalline Fe-oxides
Na acetate Ca phosphates (excl. lithogenic apatite)
HCl Lithogenic apatite
  1. *adapted from ref. [23]