EPR spectroscopy can be used to reveal formation of true humic compounds di
rectly in humifying plants. In the initial stage destruction of lignine mac
romolecules takes placse. After 50 days of humification in laboratory condi
tions molecular fragments of polyconjugation were formed in the straw. Afte
r 70 days, supramolecular associations characteristic of humic acids are fo
rmed. The humification process is variable.