Humus generally refers to the decomposed organic residues which have undergone a series of degradation and synthesis cycles. The humic substances consist of a series of highly acidic, yellow to black coloured, high molecular weight compounds __________________, which can be separated using different extraction procedures:

Question

Accepted Answer

Humic acid & Fulvic acid. Humic substances are primarily classified into humic acid, fulvic acid, and humin. The question asks for the compounds separated by extraction procedures, which typically yield humic acid and fulvic acid as the soluble fractions.