White Diesel Haze Auto - 1st indoor grow

overdrying in soil just creates salt build up, you overfed plant, now its aftermath. stop feeding and water with run off, plain water diet for few we/dry cycles at least. be wise, dont do any flushes in soil, it brings more problems than sort things, its for coco or hydro. lift pots, dont do basic mistakes as under or overwatering, have good regime . plant will look sad and harvest will be influenced by those mistakes.

This looks a lot like the plant is taking the mobile nutrient Nitrogen in the lower leaves and moving it up into the new growth. It may just require more feed and better watering, the older yellow growth is not likely to bounce back. But should stop progressing once you address the issue. Good Luck!

FYI my NPK now 6-13-18