4th week in flower some yellowing

They are clones and since first post there are 6 of 12 plants turning yellow. PH and everything is fine, water in reservoir is 70 degrees room temp when lights are off is 66 with 65% humidity and with lights on 77 degrees with 53% humidity.

it sounds like a lack of nitrogen

maybe your waters hot did you get reading off the water in the buckets or just the rez.

TO MUCH P,,,,I actually get tired of saying this.
P tox from the use of high P bloom foods.
Wow, 900 dollars of plant killing technology at work! I don't like this company already and even more so when I go to their site to figure the NPK of what your using and they list NOTHING for the values. Check the MSDS and it flips you to the feeding charts.......Now that's trying to hide something in my book !

Ok, pitch their feeding charts and try this.
Run veg to the END of week 3 of bloom and THEN dump and switch to Bloom foods.
Don't "spike" the P&K till week 6 and again at week 8......That should stop the high P yellowing.

By the way "kiddies". It's NOT low N and ANY amount of added N at this point will do NOTHING for this problem!!!!

Another example of wild claims and over use of P in flower to "attempt" to boost flowering, by a company that is less then forthcoming with the truth!

This company has just gone into my "untrusted" file.

For FAR less money and even results in hydro (still watch the bloom boosting).
Hesi
Canna
Dyna-Gro (You should run the "grow" all they way through).
Cyco

Flush and re-adjust nutrients you will be fine. Good information - many grower don't know the stages of flower (early, middle and late) and that different nutrients are required to get good results

I missed that part 900$ is plain crazy to spend on nutes plus they dont say whats in it? everyone should be reading the msds before using any product. Sounds like some stores I know covering labels that say not for food product use with an purposefully over sized price tag.

I've never grown your strain, but…

I've never had a problem with yellowing like that, until now. I'm currently growing a God's Gift and a Pennywise in hyrdo. They're about four weeks into flower, maybe a little more. Overnight, the mid-level GG large fan leaves turned a light green, while all the other leaves on the GG are normal dark green. And the Pennywise is all dark green. Ph is fine. No slime in res.

Ok. During veg, the GG was very sensitive to nutes. Anything over 500 or 550ppm burned the tips. The Pennywise could handle more. But I kept the grow at 600ppm, with no problems whatsoever. Healthiest grow I've had. In flower, I kept the grow at 600ppm, but when those leaves suddenly went light green, I increased to 700, just in case it was a deficiency. But the bud growth is huge on that plant, so "deficiency" isn't a word I'd use.

Just waiting to see now if the 700ppm helps the plant. If not, I'm just going to hang on without worrying too much. The pistils on the GG are just starting to turn, so I'm going to guess I need another 3-4 weeks. It's possible that the GG naturally fades in this pattern, but I just don't know.

Anyway, I'm not sure if that helps or is even interesting to you. But if you've never grown that strain before, you might just make some slight adjustments and then hold on.

I flushed for two days and just added nutes today. Keeping fingers crossed, the only thing that has me confused is the buds on these plants are still growing daily and 3 of the plants are fine and still dark green.