Plant dying? please help

also another possability.... rootbound!!!!!.... ik its hrd to belive kus you got some big pots but eyyy. ya never know...

last one just died. So I am going to work on getting some clones and start over.

after reading this post :
https://www.rollitup.org/marijuana-plant-problems/132382-deficency-nute-burn-diagnostic.html

the best match was Nitrogen toxicity. Don't know how I would have gotten that, maybe to much nutes? but before the plants died they did turn a darker green.

also now that I think back, the problems started after I sprayed with Take Down. Has anyone used this product before?