I understand that there is supposed to be some yellowing of leaves during the last half of flowering. However, my leaves look "crispy" and burnt on the tips. My ph is 5.9-6.1. My ppm's have been gradually brought to 1500 into week 6. A little help??
Doing a flush with a low ppm solution actually removes more excess nutes than plain water.
Once your plants start recovering then you can gradually go up on strength.
Looks to me like there has been a lot of wind forced on them? I work with a cheese strain that does something similar when you are mature or just slightly over. Could this be an issue? 1500ppm is a waste of money and eventually give you results you may be seeing. I would recommend on your next run to run half that. seedlings here started at 100ppm and moved gradually going up to a max of 800-900ppm produces pound plants. Your plants won't grow any better faster or be more potent with high levels of nutrients and actually harms thrich production. Good Luck...JAS