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The International Humic Substances Society convenes multidisciplinary biennial international conferences, which bring together scientists from the soil, and aquatic sciences. [12] Some chapters also hold scientific conferences. [13] The society has financial grant programs to encourage the advancement of humic sciences.
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.
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 ...
The State Pharmaceuticals Corporation (SPC) is a state-owned enterprise with its headquarters in Colombo, Sri Lanka.It is the largest supplier of drugs in the country, and is tasked with providing quality-assured health care items that are safe and effective, at an affordable price, while educating the public on the rational use of drugs.
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).
It is based on market capitalisation. Weighting of shares is conducted in proportion to the issued ordinary capital of the listed companies, valued at current market price (i.e. market capitalisation). The base year is 1985, and the base value of the index is 100. This is the longest and the broadest measure of the Sri Lankan Stock market.
In 2000, only 25% of the households in Sri Lanka got their water through pipes. Even the water that does come through the pipe from local suppliers is not monitored efficiently. This is why a part of the population does not get clean drinking water. [2] Sri Lanka's wastewater management requires a lot of work.
50th Anniversary of Sri Lanka regaining Independence Blue 146.5 x 73.0 mm polymer 4 February 1998 A lion holding a sword 1000 rupees The ushering of peace and prosperity to Sri Lanka Blue 157 X 78.5 mm paper 20 May 2009 17 November 2009 [3] [4] Layard's Parakeet: 500 rupees Commonwealth Heads of Government Meeting 2013 held in Sri Lanka Purple