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Related to humic substance: ulmic acid
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|Noun||1.||humic substance - an organic residue of decaying organic matter|
organic compound - any compound of carbon and another element or a radical
fulvic acid - a yellow to yellow-brown humic substance that is soluble in water under all pH conditions; "they measured the fluvial fulvic acid"
humic acid - a dark brown humic substance that is soluble in water only at pH values greater than 2; "the half-life of humic acid is measured in centuries"
humin - a black humic substance that is not soluble in water