Originally Posted by James Howlett
A true Calcium deficiency shows as bleaching on new growth, as calcium is immobile.
What you have looks like nutrient lockout from some other issue.
Don't blame CO2 as the root issue. If anything its just making your plants work harder, adding to the lockout.
You must feed them a balanced solution consistently to fix the problem.
Maybe give some more specs on your system as aeroponics is finicky.
Also try to use EC instead of ppm since its universal.
Pretty much all of this. It is true that high ppm of CO2 needs to be matched with appropriate levels of nutes and lighting. That's just the science of the formula for photosynthesis. If there is a bottleneck, in at least one of those three factors, the photosynthesis will only be as successful as its limiting factor[s] will let it be.
That said, I agree that this is definitely not a calcium deficiency, because it is an immobile element, and you would be seeing a specific look in all of the new growth. What I see here does in fact look like lockout, which can result from several factors, most commonly pH problems. Have you confirmed that your pH meter is accurate? Have you calibrated it? Tested it against some liquid drops or something like that?
If your pH is fine, then if I were you I would consider the possibility that you have fusarium, or some other fungal infection as was previously mentioned. Hell, maybe there's even some strange environmental factor in your new location, like offgassing from some construction product or something random like that.
But yeah, that looks like lockout.