Nitrogen deficiency? What can I do to fix it?

Hey! The only yellowing leaves i see are on the very bottom, none in the middle or top. I'd say your nutes are good, those laves are most likely turning yellow because they don't receive enough light and she's focuing her energy on thos bud sites. I would remove those bottom yellow leaves, wait 4-7 days and see how see reacts. If you notice more yellowing up the PK in your feed. Any nutrient in the fox farm line that has higher PK. I suggest you follow the manufactures doses.. Hope this helped. Good luck and happy growing!