| LC control no. | sh 85136387 |
|---|---|
| Topical heading | Trace elements |
| Variant(s) | Accessory elements Microelements Micronutrients Minerals, Trace Minor elements Trace metals Trace minerals |
| See also | names of specific elements, e.g. Boron Agricultural chemicals Chemical elements |
| Found in | Major- and trace-element analyses of Steens Basalt, southeastern Oregon, 1998: p. 1 (major- and trace-element analyses of 85 lava flows and dikes collected from the Steens Basalt at Steens Mountain, Oregon) Dictionary.com, July 15, 2014 (trace element noun Biochemistry: any element that is required in minute quantities for physiological functioning. Also called trace mineral.) Merriam-Webster online, July 15, 2014 (trace element : a chemical element that is present only in very small amounts; a chemical or element that a living thing needs in very small amounts in order to live) Collins English dictionary, via WWW, July 15, 2014 (trace element: any of various chemical elements, such as iron, manganese, zinc, copper, and iodine, that occur in very small amounts in organisms and are essential for many physiological and biochemical processes) Encyc. Britannica online, July 15, 2014 (trace element, also called Micronutrient, in biology, any chemical element required by living organisms in minute amounts, usually as part of a vital enzyme, a cell-produced catalytic protein. Exact needs vary among species, but commonly required plant micronutrients include copper, boron, zinc, manganese, and molybdenum. Animals also require manganese, iodine, and cobalt. Lack of a necessary plant micronutrient in the soil causes plant deficiency diseases; lack of animal micronutrients in the soil may not harm the plants, but, without them, animals feeding solely on those plants develop deficiency diseases.) Wikipedia, July 15, 2014 (In analytical chemistry, a trace element is an element in a sample that has an average concentration of less than 100 parts per million measured in atomic count or less than 100 micrograms per gram. In biochemistry, a trace element is a dietary mineral that is needed in very minute quantities for the proper growth, development, and physiology of the organism. In geochemistry, a trace element is a chemical element whose concentration is less than 1000 ppm or 0.1% of a rock's composition.) Plant nutrients, via North Carolina Dept. of Agriculture & Consumer Services website, July 15, 2014 (Sixteen chemical elements are known to be important to a plant's growth and survival. The sixteen chemical elements are divided into two main groups: non-mineral and mineral. The Non-Mineral Nutrients are hydrogen (H), oxygen (O), & carbon (C). The mineral nutrients are divided into two groups: macronutrients and micronutrients. Macronutrients can be broken into two more groups: primary and secondary nutrients. The primary nutrients are nitrogen (N), phosphorus (P), and potassium (K). The secondary nutrients are calcium (Ca), magnesium (Mg), and sulfur (S). There are usually enough of these nutrients in the soil so fertilization is not always needed. Also, large amounts of Calcium and Magnesium are added when lime is applied to acidic soils. Micronutrients are those elements essential for plant growth which are needed in only very small (micro) quantities. These elements are sometimes called minor elements or trace elements, but use of the term micronutrient is encouraged by the American Society of Agronomy and the Soil Science Society of America. The micronutrients are boron (B), copper (Cu), iron (Fe), chloride (Cl), manganese (Mn), molybdenum (Mo) and zinc (Zn).) Distribution and abundance of select trace metals in Chukchi and Beaufort sea ice, 2016: page 1 (trace metals; trace elements) |
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