Fig. 2. Cross polarization magic angle spinning (CPMAS) 13C nuclear magnetic resonance (NMR) spectra of straw, pig feces, and compost bed after 1 and 4 wk of composting.
Fig. 2. Cross polarization magic angle spinning (CPMAS) 13C nuclear magnetic resonance (NMR) spectra of straw, pig feces, and compost bed after 1 and 4 wk of composting.