Ko te Humus he matū parauri pouri-parauri, amorphous, polydispersed me te taumaha ngota ngota teitei e tino paheke ana. He mea hanga mai i te pirau tinana, matū me te moroiti me te hurihanga o nga toenga kararehe me te tipu. Na reira, he nui te noho i roto i te oneone, te peat, te lignite, te wai me te parataiao. Ko nga kai kaha matua i roto i te humus ko te waikawa humic me te waikawa fulvic, me te iti o te humin. I te mea ka whakarewahia te waikawa humic ki te kawakawa engari karekau ki te waikawa, ka whakarewahia te waikawa fulvic ki te waikawa me te kawakawa, karekau hoki te humus ki te waikawa me te kawakawa, karekau te HM i te waikawa me te kawakore. , no reira ka taea te wehe me te purea ki tetahi waahanga ma te whakarewatanga. Ko te waikawa humic he waikawa waro macromolecular i tito mai i nga roopu mahi kakara me nga momo roopu tauhohenga. He nui te tauhohenga, ka whakamahia nuitia i roto i nga mahi ahuwhenua, rongoa me te tiaki Taiao me etahi atu mara.