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Oldest leaves turning yellow

Waveform
Waveformstarted grow question a year ago
What could be the cause of oldest leaves turning spotty yellow on 3 week old plants? They got nutritients end of last week for the first time, but not that much.
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Leaves. Color - Yellow
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Krisis
Krisisanswered grow question a year ago
Looks like there’s yellowing in between the veins of the leaf to me. That or the lights making it look that way. Anyhow that’d be magnesium deficien
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jeeje
jeejeanswered grow question a year ago
I cant see the whole plant, but from the picture it looks like nitrogen deficiency.
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