Sounds like you have an imbalance somewhere. I use this chart to get an idea of what to test for and/or dose. It's not comprehensive or anything but is a really good resource.
I'm assuming it is the new growth that is yellowing so it could be iron or nitrates. If it is just the edges of the leaves then I'd lean towards potassium IME.
I'm assuming it is the new growth that is yellowing so it could be iron or nitrates. If it is just the edges of the leaves then I'd lean towards potassium IME.
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