The soil forming process that transforms plant tissues into organic matter, on or in soil.
The biological process of converting organic matter into humic substances.
A natural process whereby organic residues are transformed and converted to stable humic substances through biochemical and chemical processes.
The decomposition of organic matter leading to the formation of humus. The microbial synthesis of three-dimensional polymers of saccharides and phenols resembling gums and lignin, a process of storing organic energy in compounds of high molecular weight which are slowly degradable (10-100+ years).