Humic is an organic matter that has a complex structure and is very resistant to decay. It is black or brown in appearance and contains elements such as carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur and other elements. Soil humic is formed after soil microorganisms decompose the plant remains. Then the microorganisms will synthesize organic compounds such as amino acids, proteins and aromatics after the microorganisms have died and accumulated for a long time. The combination of amino acids or proteins with aromatic compounds becomes humic in the soil.
