Synthetic micronutrients may only be used for fertility, they must be OMRI-listed, and there must be a documented deficiency in the form of a soil or tissue test. Remember to ask:
Is this micronutrient…
- …being applied for crop/soil fertility?
- …OMRI-listed?
- …documented by a soil or tissue test?
Therefore, even if a producer is using an OMRI-listed synthetic micronutrient they must ALSO document the need for the deficiency in order to use the product.
This applies to the following nutrients:
- Boron
- Zinc
- Copper
- Iron
- Manganese
- Molybdenum
- Selenium
- Cobalt