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Sodium hexametaphosphate (SHMP) is a salt of composition Na 6 [(PO 3) 6]. [3] Sodium hexametaphosphate of commerce is typically a mixture of metaphosphates (empirical formula: NaPO 3), of which the hexamer is one, and is usually the compound referred to by this name. Such a mixture is more correctly termed sodium polymetaphosphate.
Plant nutrition is the study of the chemical elements and compounds necessary for plant growth and reproduction, plant metabolism and their external supply. In its absence the plant is unable to complete a normal life cycle, or that the element is part of some essential plant constituent or metabolite .
The artificial solution described by Dennis Hoagland in 1933, [1] known as Hoagland solution (0), has been modified several times, mainly to add ferric chelates to keep iron effectively in solution, [6] and to optimize the composition and concentration of other trace elements, some of which are not generally credited with a function in plant nutrition. [7]
In addition, some humectants are recognized in different countries as good food additives because of the increase in nutritional value that they provide, such as sodium hexametaphosphate. [ 6 ] In order to gauge a compound's humectancy, scientists will put it through a series of tests, often involving water absorption.
Dennis Robert Hoagland (April 2, 1884 – September 5, 1949) was an American chemist and plant and soil scientist who pioneered work in plant nutrition, soil chemistry, agricultural chemistry, biochemistry, and physiology. He was Professor of Plant Nutrition at the University of California at Berkeley from 1927 until his death in 1949.
Early history [ edit ] The original product consisted of powdered sodium hexametaphosphate (amorphous sodium polyphosphate), which, in water, would complex with ambient calcium ions and certain other cations —preventing formation of unwanted salts and interference by those cations with the actions of soap or other detergents .
In the 1930s phosphates (sodium phosphates) and polyphosphates (sodium hexametaphosphate) were introduced, continuing with the introduction of phosphonates (HEDP, ATMP, EDTMP). While these phosphorus-based agents are generally non-toxic they are now known to cause nutrient pollution , which can have serious environmental consequences.
Eric John Hewitt, FRS (27 February 1919 – 1 January 2002) was a British plant physiologist who pioneered the study of plant nutrition in the 20th century.. He is commonly known for compiling the nutrient recipes for the Long Ashton Nutrient Solution in his landmark book on sand and water culture methods, first published in 1952 [1] and revised in 1966.