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Definition of Micronutrient

Micronutrient Definition from Science & Technology Dictionaries & Glossaries
Soil Glossary - Mani
Agricultural Glossary/yigini2004
Micronutrient Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
Micronutrients are nutrients required by  organisms throughout life in small quantities to orchestrate a range of physiological functions. For people, they include dietary trace minerals in amounts generally less than 100 milligrams/day - as opposed to macrominerals which are required in larger quantities. The microminerals or trace elements include at least iron, cobalt, chromium, copper, iodine, manganese, selenium, zinc and molybdenum. Micronutrients also include vitamins, which are organic compounds required as nutrients in tiny amounts by an organism, as well as phytochemicals.

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Micronutrient Definition from Society & Culture Dictionaries & Glossaries
Environmental Engineering (English ver.)
A chemical element required only in small amounts (usually less than one part per million (ppm) in the plant) for the growth of plants.
Micronutrient Definition from Medicine Dictionaries & Glossaries
The Glossary of the American Council on Science and Health
Any essential nutrient that is a mineral (especially a trace element) or a vitamin.
Aids Glossary
a trace element; an organic compound small amounts of which are essential for physical health, growth and metabolism.
Micronutrient Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

1. a substance needed only in small amounts for normal body function (e.g., vitamins or minerals)
(hypernym) substance, matter