From what I have read, low copper is not that common.
It can occur when you have high zinc levels or intake...as they are connected somehow during absorption.
When copper gets low, there is an anemia that happens as well.
Here is a good monograph with references on copper:
http://lpi.oregonstate.edu/infocenter/minerals/copper/
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Weezie looking at petunias 8.25.2017
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