The use of copper is not quite related to copper as a soluble element, but as 
a ''mineral'' in its raw elemental form in very small and tiny filings as the 
soil abrades micro-amounts of the cu away from the tool.  Iron destroys soils 
water holding capacity and certainly has other deleterious effects, yet we do 
not analyze the need for iron when we apply a steel implement to our soils 
and abrade this elementinto our soils.  SStorch

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