Humic acid wani abu ne na halitta wanda ke samuwa a cikin ƙasa, laka, da ruwa. Hadaddiyar hadadden kwayoyin halitta ne, wadanda suka hada da carbon, hydrogen, oxygen, nitrogen, da sulfur, kuma ana samun su ta hanyar rubewar matattun tsirrai da kwayoyin dabbobi a kan lokaci.Humic acid is a key bangaren na humus, wanda shine duhu, kayan halitta wanda ke ba da ƙasa halayenta launi da haihuwa. Abu ne mai tsayin daka wanda zai iya dawwama a cikin ƙasa na ɗaruruwa ko dubban shekaru.A aikin gona, ana amfani da humic acid azaman kwandishan ƙasa don inganta tsarin ƙasa, riƙe ruwa, da wadatar abinci. Hakanan za'a iya amfani da shi azaman wakili na chelating na halitta don haɓaka haɓakar ƙwayoyin micronutrients ta tsire-tsire.