Hmm when I look at that I see Over watering/ possible heat stress PH issues and nute burn....but heres the good news if your pot is still wet I would go ahead and flush it with water phed @ 6 your looking for runoff to be around 6.8ish the lower PH will help that happen faster. Finish your flush with a 1/4 str nute mix.

ALso looks like you have a clay pot, I doubt it has enough drainage. Dont water until that soil is dry and the pot is much lighter, before you water again transplant into something with more holes in it or place a layer of perlite on the bottom of your pot.

What kind of soil are you using? also what are you feeding with? That looks to be a major issue I personally have used fox farm grow big big bloom and tiger bloom with good results and 1/2 str I even use cannas coco line in soil with good results.