MIGrampaUSA
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K like potassium deficiency?
I think that's part of what happens in some cases, when we pound a plant with too many photons. The plant can't move these nutrients fast enough due to such high light intensity. The weakest link is exploited. It's why sometimes light burn expresses itself with the zebra striped magnesium deficiency pattern or a potassium deficiency pattern and so on. I'm not sure how accurate I am in explaining this... it's an observation I have made based on my personal grows and the other grows I have seen.