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Name the deficiency.
Green_Coffeestarted grow question 4 years ago
Problem is mainly occurring on leaves near the top, but not the newest growth. Initially are less green, then start to yellow followed with brown spots. The oldest leaves near the bottom are seeing some effects, but as acute as the mid-upper leaves. Curl likely due to warm temp
like
CanadianFillmoreanswered grow question 4 years ago
It's my opinion that you're looking at a potassium deficiency, but there is also a small possibility this could be a Nitrogen deficiency.
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