Abstract
15N and 13C CPMAS spectra of composted plants are presented. The plants ( L. rigidium and Zea mays) were grown in 15N enriched medium and fennented for several months until an approx. 80% of the dry matter was lost. In all 15N spectra the secondary amide/peptide peaks a 87 ppm contributes more than 80% of the total intensity. No new 15N peaks are formed during the fermentation process. Older attempts to assign a significant fraction of humic acid nitrogen to heteroaromatic structures formed in the fermentation process are thus most probably wrong.
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