OnlyFractured
Active Member
I replied to this thread not because I can necessarily help you, just because I have similar problems... just so you know. I grow differently, I'm using pro-mix rather than soil and am providing all nutrients myself, semi-hydro I guess. I'm 90% sure I'm not over fertilising because I never go over about .7 EC and use Dyna-gro FP with maybe a little cal-mag once in awhile from beginning to end.. Every 3rd watering I give it straight ph'd water. I grow in 5 gal plastic pots and use led's for lighting. I've got some plants at about 6 weeks of flower that look quite similar to yours. I vegged them in 2 gal pots and transplanted to 5 gal pots when I put them in the flower area. Very little stretch and they started to yellow on the top to mid leaves about week four, bottom leaves are fine. There's surprisingly little height difference between the 2 gal and the 5 gal pots. I think I water too fast, it compresses the medium, they get little oxygen and because of the compression the bottom dries too slowly meaning I'm building a toxic area at the bottom of the pot.
I've got some of the same clones in the flower room at week 4 now and they are green from top to bottom. I vegged those in much smaller pots (and actually for longer), they had some stretch but more of a filling out in the first couple weeks. My thinking right now is that by vegging in the smaller pots, then moving them to the 5 gals it gave the roots some expansion room before they hit the toxic sludge/low oxygen zone at the bottom. I'm also watering more slowly now to hopefully prevent compression of the medium.
Sorry for the long post with no solution to your problem, but I'm following this thread because your grow looks so similar to mine. I'm semi-convinced that my problems are caused by inadequate drainage, and compression causing a lack of oxygen in the bottom of the pots. They never dry down there.
On the other hand, like others have said, it's possible you have over fertilised to cause the lock-out.