humic substance

English Thesaurus

1. an organic residue of decaying organic matter (noun.substance)

hypernym	:	organic compound,
definition	:	any compound of carbon and another element or a radical (noun.substance)

hyponym	:	fulvic acid,
definition	:	a yellow to yellow-brown humic substance that is soluble in water under all pH conditions (noun.substance)

hyponym	:	humic acid,
definition	:	a dark brown humic substance that is soluble in water only at pH values greater than 2 (noun.substance)

hyponym	:	humin,
definition	:	a black humic substance that is not soluble in water (noun.substance)