Deficiency mid flower

Day 38 flower
Strain: gorilla glue 4
Medium: soilless peat based mix
Pots: 5 gallon
Nutrients: GH flora serries ph'ed 5.9-6.1
950 PPMs
Water: RO with cal mag added watered EOD
Room temp: 74
Co2 1100 ppms
Lights: CMH at proper distance

Im having the same issue pop up during flower over and over. This particular run is the same issue but much more severe. Leaf health is always absolutely perfect for veg and first 2 weeks of flower. Then about 2 and a half in it starts happening and progressively gets worse. on previous runs I thought I was overfeeding PK so I eliminated the liquid kool bloom. Basically following the 3 part recommended feed chart minus the kool bloom. But now I'm thinking I have a bad phosphorous deficienty all along and now worse. Also looks like a magnesium deficiency but wouldn't make sense because I'm adding cal mag and it's it's in the florabloom What do you guys think?

whats the runoff? id say over ferting and its so overferted its locked. Its different than ive seen with its blotchiness.

nxsov180db said:

What ml/gallon are you feeding of each GH flora series? I used to have a similar problem until I learned how to feed in the correct ratios...

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I'm following the recommended drain to waste chart exactly. Minus no liquid kool bloom.

cookie master said:

whats the runoff? id say over ferting and its so overferted its locked. Its different than ive seen with its blotchiness.

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I'm not sure the runoff. I'll give it a check this next water.

i locked out a plant once & it looked alot like this.
i mixed raw k2s04 & cal-mag to lock mine out.
not sure what you're doing wrong, but it looks similar.

The damage is done, so just limp it in. Don't do anything too drastic try your next run with a slightly higher ph try 6.3-6.5. Clean and re-calibrate your ph meter. Looks like looks like lock out and stunted roots to me.

Assuming it is lockout im more concerned about how to avoid this issue in the future. I'm following the drain to waste protocol exactly(Minus liquid kool bloom. Im extremely detailed on ph, Never one feeding where things arnt spot on. And not adding in other npk or cal mag supplements in from other companies. So I'm kinda stumped on this.

I have stopped using cal/mag and I now use Epsom for the Mag and Sulfur. They don't need so much calcium. They are not tomatoes.

That's toxic salts buildup. I've been having a problem with it for years due to really low humidity so will be lowering the ppm drastically. Been blaming it on too much N in later flower but pretty certain it's the 20 - 30% RH we have most of the year. Even now in the heat of summer the grow room hasn't got over 60% @75F.

Cut your ppm way down but it will likely progress regardless.

Good luck.