What kind of deficiency is this?

Rayshian
Rayshianstarted grow question 5y ago
The last blue dream plant I grew had the same issue but I’m not sure what it is. Any help would be appreciated.
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Week 19
Leaves. Curl down
Leaves. Color - Yellow
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Ezzjaybruh
Ezzjaybruhanswered grow question 5y ago
I believe this is potassium deficiency. K deficiency causes internal temps of foliage to rise and it causes the protein in the cells to burn and degrade. Usually happens on the edges of the leaves.
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