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Fig. 6. Phosphorus-31 CP and DP NMR spectra of residue and extract (unamended and neutralized) fractions from NaOH–EDTA extraction of soil M-H. Note that the vertical scales have been adjusted to allow direct comparison between corresponding CP and DP spectra for each soil fraction, but not among fractions. Spinning side-bands are marked with an asterisk (*). The sharp signal seen at 15 ppm in some of the spectra is an artifact caused by breakthrough of the transmitter pulse.
