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| I know there are several existing threads on the use of copper sulfate for crop production, but I haven’t found any good input to what I’m specifically looking at. I have used chelated copper at at very low rates in furrow, and I understand that chelated copper is a superior product to copper sulfate for some applications. Currently, my soils range from 0.5-1 ppm. My questions specifically are:
1. Is rates of say a 1/2# per acres of high grade copper sulfate mixed in with pre, post, or fungicide pass enough to inhibit performance of other chemicals as long as it’s added right before application?
2. Is anyone having good results running say 1/2 of a pound copper sulfate in their in furrow mix? Does this having too high of a slat index?
3. When trying to build copper levels as a way to help manage disease, is it best to build soil levels to say 4-5 ppm, or is it better the actually get copper into the plant tissue or on the plant surface via foliar at mid vegative stages and with fungicide passes.
4. Do we see a better response to fighting disease with copper when targeting a particular range in the soil, or a particular ppm on a tissue test, and if we are targeting a range on tissue tests, how high is that target? Currently seeing copper tissue tests in the 13-15 ppm range in r1-r3 using a half a pint of chelated copper in furrow. If we get these levels to say 20-30 ppm, is disease pressure greatly helped, or is the main point having copper on the plant surface. TIA!
Edited by crag 9/22/2025 19:51
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Copper sulfate
