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Potassium humate is used in agriculture as a fertilizer additive to increase the efficiency of fertilizers especially nitrogen- and phosphorus-based fertilizer inputs. Other salts of humic acid are manufactured, mainly sodium humate, which is used in animal health supplements. It also can be used in aquaculture.
The International Humic Substances Society was founded in Denver, Colorado, USA, on September 11, 1981 by scientists who saw a need for a society to bring together scientists in the coal, soil, and water with interest in humic substances, and to provide opportunities for them to exchange ideas .
Humic substances account for 50 – 90% of cation exchange capacity in soils. "Humic substances" is an umbrella term covering humic acid, fulvic acid and humin, which differ in solubility. By definition, humic acid (HA) is soluble in water at neutral and alkaline pH, but insoluble at acidic pH < 2. Fulvic acid (FA) is soluble in water at any pH.
It is reducible to a fine powder by trituration, and if submitted to the action of a weak solution of potash, it yields a considerable quantity of humic acid. [38] Leonardite is an oxidized form of lignite, which also contains high levels of humic acid. [57] Jet is a hardened, gem-like form of lignite used in various types of jewelry. [41]
Dystrophic lakes, also known as humic lakes, are lakes that contain high amounts of humic substances and organic acids. [1] The presence of these substances causes the water to be brown in colour and have a generally low pH of around 4.0-6.0. [ 2 ]
Apparently "humic substance" is a relatively rarely used term and concept, which refers to compounds present in untreated humus; whereas "humic acid", "fulvic acid" and "humin" are not "humic substances", but compounds derived from humus by chemical treatment. While "humic acid" and "fulvic acid" have indefinite chemical composition, they are ...