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I bunch of my leaves have a bunch of these discoloration spots.  You can see it best in the spot by my thumb in the picture.  What deficiency is this?

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Thanks're a genius!

Check ths following Low nitrates, Hard water, Chlorine content in the water, Aphids or Thrips, possible high pH

Also this looks beyond a deficiency, there is tissue damage beyond a mere chlorosis...

I'm no expert, but I just learned that if you're growing in a greenhouse and have fruit/veggie-bearing plants growing together with the leafy plants, the ethylene gas emitted by the fruit/veggie bearers for ripening can cause brown/discoloring spots on your leafy plants. Might this be your cause?

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