Definitely phosphorus, not a doubt in my mind. That's the textbook expression of P def, especially with the damaged areas being very brittle. Phosphorus is best applied at the root, but a foliar feed will help somewhat. Depending on what stage of growth you're at, this could be an instance where a chemical fertilizer is warranted (only to correct the issue and get things back on track). Organic/veganic will take a few days longer to correct it.


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