What is wrong?

Probably followed the instructions of AN, lol. if going soilless good to understand each individual nutes ppm... or weighted ratios of nutes by % -- both can get you to the same ends. the brand ofnutes doesn't matter one bit, so find the cheapest that provide a full diet. soilles nutes (coco included) just have to be 100% soluble and 100% plant-available. These are the same type of fertiizers used in hydroponics, too. NPKCaMgS ppm -- 120-130 50-60 180-200 100+ 50-75 100+ That's a lower starting point.. maybe 1.3EC give or take. In flower, can drop N to 110ish. Regardless, have to observe plants because genetic variance and environmental variables will cause variation. weighted average of american labeling standards and anywhere else that uses the same is 1-1-2 npk and 4-2-1 K-Ca-Mg .. i find marijuana needs a bit more magnesium than that, but otherwise the above ppms come from very similar ratios.. again, these are even more ballpark ideas than the ppm above. Meant as a good starting point from which to adjust based on observations. Any issues will be small and slowly progressing so you can be patient and confident about the reaction/adjustment to them. take notes and avaoid the problem the next time. there is very little difference in needs from vege to flower. plenty of studies show that overdosing p and k does nothing for yield. The plant still needs a good bit of nitrogen despite the cessation of stem elongation and leaf growth. N is needed for all cellular growth.. even dna has N in it.. can't replicate any cell without more N. If you really gassed it in vege with N you may need a larger drop off in bloom. Accumulation will impact need. The bottom line is that it is not foie gras. You cannot force feed a plant. It's metabolism, as defined by gentics and local environment, cannot be circumvented.

Burned to a crisp.

It's low light and too much nutrients and all this fact damage imunne and cause this. I got exactly like this on the smallest plant in tent. It's only my little opinion :)

Multiple issues. Had you asked some questions 3-4 weeks ago when the issues probably first started appearing, there may have been a chance to fix things. However, these issue are now so advanced, there is nothing that can be done to restore health before harvest maturity. Definitely nutrient issues, but without a diary, pinpointing what exactly went wrong is almost impossible.

Hi, here I see more than one issue. Light burn is one of them and I guess there is also a nutrient lockout. Try to flush and raise or lower the lamps. good luck 💪💪💪