Parameter Tree:
EARTH SCIENCE > LAND SURFACE > SOILS > MICRONUTRIENTS/TRACE ELEMENTS

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.


Reference:
Glossary of soil Sciece Terms, 1996. Soil Science Society of America, Madison,
WI. http://www.soils.org/sssagloss/