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Is this a calcium issue?
Fermentedhopsstarted grow question 4 years ago
I noticed some discoloration on several leaves but not widespread. I think it is calcium deficiency but to make sure. Whatever ails her, a more informed opinion would ease my mind. Also, if it is a calcium issue, would raising from 3 to 5ml/gal of calmagic resolve it? (DWC)
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420TouristguideDWCanswered grow question 4 years ago
That looks like a Calcium deficiency to me more so than a Magnesium one. If your PH is 6.5 I'd say it is too high for a Hydro grow. I'd recommend getting it to 5.8 to 6.1 so that both Cal and Mag are able to be taken up together. Since Calcium is immobile the plant can't "rob" it from older growth.
Here is a good link that has the Botaincare Nutes image that will help you out.
https://i.pinimg.com/736x/2b/b6/c4/2bb6c485409b6a2515024e8e91dfee2a.jpg
Tango_Hotel_Charlieanswered grow question 4 years ago
if it is a calcium. or magnesium problem, yes, of course. I have a cultivar im running now that is a cal/mag whore. I give them 7 tablespoons per 5 gal. that is 1.5 times recommended dose
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