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Ca deficiency?
DavidRayManstarted grow question 6 months ago
Hey Gromies! Does this look like calcium deficiency?
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Leaves. Color - Mottling
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Organomananswered grow question 6 months ago
No not calcium deficiency, but nitrogen toxicity.
You have burned leaves.
Calcium deficiency will initially present as small brow dots/spots.
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001100010010011110answered grow question 6 months ago
dark inteveinal looks like a p-deficiency, but that should occur at bottom of the plant, first. (mobile nute)
P can be locked out by calcium. Have you added a ton of that over time? in a soilless/hydro context all you need is 100-130 ish.. local tap water will have some in it and causes a bit of variance as well is local VPD as far as what concentration you need of each nute, but it's a good ballpark for most people. if in soil, this info isn't too useful because there are so many unknowns about what came pre-charged in the soil in addition to your fertilization.
P also has a bidirection stimulative relationship with Mg.. if you added extra Mg lately but also didn't up dose of P with it, that too could cause a p-deficiency symptom.
Good thing is it is progressing fairly slowly? So, let it present itself a bit more to be certain. Reference a simply leaf chart and Mulder's Chart (informs about antagonistic vs stimulative relationships between nutes) to make an educated guess.. that's all we ever have.
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