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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 .
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 ...
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.
Rubber production in Sri Lanka commenced in 1876, with the planting of 1,919 rubber seedlings at the Henarathgoda Botanical Gardens in Gampaha. [1] The total extent under rubber in 1890 was around 50 ha (120 acres) and in the early 1900s it increased to around 10,000 ha (25,000 acres).
The following other wikis use this file: Usage on ar.wikipedia.org حمض دبالي; Usage on ca.wikipedia.org Àcid húmic; Usage on de.wikipedia.org
John Keells Holdings PLC (JKH) is a Sri Lankan multinational conglomerate company. It has business interests in hotels and resorts management, port, marine fuel and logistics services, IT services, manufacturing of food and beverages, supermarkets, tea, stock broking, life insurance, banking, and real estate.
6 Indian Tamils of Sri Lanka. 7 Colombo Chetties. 8 See also. Toggle the table of contents. List of Sri Lankans by ethnicity. ... Sri Lankan Malays Indian Tamils of ...