| definition
| - A plant nutrient usually found in relatively small amounts(<100 mg
kg-1) in plants. These are usually B, Cl, Cu, Fe, Mn, Mo, Ni, Co, and
Zn. In environmental applications it is those elements exclusive of the eight
abundant rock-forming elements: oxygen, aluminum, silicon, iron, calcium,
sodium, potassium, and magnesium. (en)
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