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I've been growing off and on for a few years and have not had a problem like this before (or at least not this bad):
It's a single Cherry Pie fem in FFOF under a 150 watt HPS with five 23 watt CFL's along the sides. Leaves seem to turn yellow, wither , and die. Edges brown and turn crisp before falling off. I'm thinking it's a nitrogen defficiency, but I'm not sure and would like a second opinion before I try anything.
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