MrStinkyanswered grow question 3 years ago Rule of thumb:
Lower / older leaves yellowing / browning it is generally NPK related
Younger / higher growth yellowed / wonky generally micro or immobile nutrients.
Which diary is that from? Cant see anytjing recent.
If you are flowering and 3-4+ weeks from harvest, balance pH and feed, if 1-3 weeks and there is a lot of plant still green dont worry
If young plant, maybe over watering or dodgy pH.