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Fig. 2. Solid-state ³¹P cross polarization (CP) and direct polarization (DP) spectra of unamended soil and soil amended with pyrophosphate supplying 2000 mg P kg soil^–1 and incubated for 1 to 21 d. The vertical scales of the spectra have been set to allow direct comparison within the series of CP and DP spectra.

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