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Micronutrients>Copper

Copper

Copper plays a role in chlorophyll production. It may also have a role in the suppression of some diseases.

Copper deficiencies are most common in crops grown on organic (muck) soils.

Crop Copper deficiency symptoms
Carrots Pale roots
Onions Tip dieback, curling of leaf tips; thin, pale-yellow bulb scales
Lettuce Leaves lose firmness; yellow bleached stems

There is no OMAFRA-accredited soil copper test. Soil tests are unreliable on Ontario soils. Plant analysis is a more useful tool. Copper availability may be lower on coarse sands with very low organic matter and organic or muck soils. Copper availability decreases as soil pH increases.