Oldest leaves turning yellow

Waveform
Waveformstarted grow question 3y 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 3y 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 3y ago
I cant see the whole plant, but from the picture it looks like nitrogen deficiency.
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