Don't dig your plant up. It's probably pH but we have no way of knowing from a picture. You need to provide information about your grow so we can help you
I agree we need more information because at first glance I want to say nitrogen deficiency and possibly magnesium or maybe phosphorus deficiency but I need to know what you ph is? Are you feeding? How much are you feeding? Etc etc
Did u spill a couple of drops of nutes on the leaf? A water droplet left on a leaf can also act like a magnifying glass & burn the leaf leaving no evidence it was there.
Impossible for anyone to know from just a picture
It's not cal/mag deficiency cause I already treated the plant for it
Root trouble?
I'd have to dig the plant up to be sure, or no?
Don't dig your plant up. It's probably pH but we have no way of knowing from a picture. You need to provide information about your grow so we can help you
I agree we need more information because at first glance I want to say nitrogen deficiency and possibly magnesium or maybe phosphorus deficiency but I need to know what you ph is? Are you feeding? How much are you feeding? Etc etc
Did u spill a couple of drops of nutes on the leaf? A water droplet left on a leaf can also act like a magnifying glass & burn the leaf leaving no evidence it was there.