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. 2022 Feb 2;158(1):39–72. doi: 10.1007/s10533-021-00884-7

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Fig. 4 — Contents (left panels; mg P kg⁻¹) and relative contribution (right panels) of different Hedley P fractions (labile P: resin + NaHCO₃-extractable P; moderately labile P: NaOH-extractable + 1 M HCl-extractable P; stable P: 7 M HCl-extractable + aqua regia-extractable P) in different mineral soil horizons of profiles Mangfallgebirge N1 and S1, Tuttlingen NE, Schänis, and Bärenthal