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It is used to condition soils either by applying it directly to the land, or by providing a source of humic acid or potassium humate for application. The carbon geosequestration potential of Leonardite, particularly to rapidly accelerate microbial action to lock up and retain carbon in soils, provides the basis for extensive research in Victoria on the organic fertilising aspect of brown coal.
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.
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 .
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.
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 ]
The Friedrich-Engelhorn-Hochhaus, headquarters of BASF from 1957 to 2013. Chemical & Engineering News publishes an annual list of the world's largest chemical producers by sales, excluding formulated products such as pharmaceutical drugs and coatings. [1]