| In the past these elements were called
"micronutrients are also essential in plant nutrition but are needed in relatively
small nor elements" or "trace elements," but the term micronutrients is
preferred because these elements are those needed by the plants in very small or
"micro" amounts. The seven micronutrients are:
| BORON (B) |
CHLORINE (Cl) |
COPPER (Cu) |
| IRON (Fe) |
MANGANESE (Mn) |
MOLYBDENUM (Mo) |
|
ZINC (Zn) |
|
There are several reasons why use of micronutrients
has increased in recent years:
- Increased knowledge of their role in plant nutrition,
deficiency symptoms in plants, and behavior in soil.
- Higher crop yields which have increased micronutrient needs.
- Improved analytical methods, resulting in more soil tests
and improved fertilizer recommendations.
- Improved sources of micronutrient fertilizers and methods of
incorporation into other fertilizers.
- Land-shaping practices, such as terracing or land leveling
for irrigation, which remove topsoil containing organic matter, often associated with most
of the available micronutrient supply.
(Reference: The Fertilizer Handbook / The
Fertilizer Institute - pp 91-92)

MINERAL
COMPONENTS |
8 ELEMENTS
COMPRISE 98% OF ALL SOIL MINERAL |
 |

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