What kinda deficiency?

[ajs6295]

On a week 8 auto white widow what kind of deficiency are you guys thinking? There was also a leaf that went completely yellow only around the edge of the leaf

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[Heavily Medicated]

I see both K and Mg defs. The burnt margins on the leaf would be indicative of a K def, and the yellowing between the veins and the veins remaining green lends to Mg def symptoms.