Seriously bad case of TSB, Toxic Salts Buildup, caused by long term overfeeding.
If smoked that pot will snap, crackle and pop like Rice Crispies on steroids and taste like 'chem' so bad. either dry sift to get the trichomes or extract for oil if you want something worth having once this crop is done.
It happens worse with low RH like I have here so I've seen my fair share of that and generally feed around 500ppm/1.0ec max especially during the winter when it's dry as a popcorn fart around here.
I'd be cropping ASAP before all those sweet sugar leaves and even the little bud leaves go all brown and crispy too. Too bad as it looks like it would have been a nice crop.
Another case of less = more.
Better luck next time!