Nute burn pr deficiency?

Harryschleem28

Active Member
So im experiencing some leaf tip browning and curling upwards. I've never had this happen before so I'm not sure if just your usual, pretty bad nute burn or something else? The other leaf symptoms include edges slightly rolling/cupping down, lower leaves yellowing but also burning at the tips, but overall still seem to have a healthy green color. Im in soil, week 3 of flower. I don't have a pH meter, never used one and only now am I having some weird issues. The only other issues I've dealt with were slight nute burn coupled with N toxicity. Im thinking of giving her a good flush when she dries about a bit more, I just feel like this might be some sort of pH issue due to me not watering her to runoff a few times and some of those waterings were feedings as well. I flushed her a bit last week or so and the water was super brown so maybe I still have a bit of trouble going on in my soil? Here are a few pictures of the leaf tips
 

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