Deficiency? Toxicity?

These 3 are Tropicana cookies by Canuks. They’ve been in veg for a few months but I can’t get rid of this deficiency so that I can finally put them into flower. They are in coco loco. I’m using synthetic nutes and supplementing with Cal Mag. Feeding at 6.6-6.8 pH. Runoff PH is 6.4. I’ve also tried to give bloom booster to see if it would help. I was pretty certain It’s a potassium deficiency, but my ph is fine and I’m adding in enough. So what else could it be?

Your pH going in is a little high for coco........should be around 6.0.
What is your feeding schedule?

It’s coco loco. It’s supposed to be treated as soil so I try to stay around 6.5. I water when dry. Every 4 days or so.

anaissoto21 said:

It’s coco loco. It’s supposed to be treated as soil so I try to stay around 6.5. I water when dry. Every 4 days or so.

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Good luck with that.

Potassium deficiency first presents itself at the bottom of the plant and does not cause interveinal chlorosis. Also, necrosis from a potassium deficiency likes to stick to the leaf margin area.

What is the EC of your feed? What is the EC of the runoff? Do you feed every time you water?

What is the PPFD of the canopy? If you don't know that, what light do you have, what's the dimmer set to, and how close is the light to the canopy?

MickFoster said:

Your pH going in is a little high for coco........should be around 6.0.
What is your feeding schedule?

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Coco Loco is basically Ocean Forrest mixed with some coco. Their coco/perlite 70/30 product with no added garbage is called Cultivation Nation. Seems like the names should be reversed. I suppose they came out with Coco Loco first and blew a cool name on a lame (as far as coco goes) product and had to come up with something else for a full coco product.

It's 60% coco coir though.
I'd be going low 6s on ph