Few nmr studies with whole soil have been successfully attempted. Solid-state 13C nmr spectra were obtained for Bainsville clay loam an orthic humic gleysol with 3% carbon, using the CPMAS technique (cross-polarization magic-angle spinning). Results for the whole soil were limited by poor signal/noise and lack of resolution, possibly due to line-broadening by iron. Better results were obtained by employing a < 50 μm fine-size fraction, and difference spectra techniques, allowing observation of added 13C-labelled acetate, and its transformation during incubation.
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Preston et al. (1983) studied this question.