What is this leaf 🍁 discolouration

ObserverInterest
ObserverIntereststarted grow question 3y ago
What is this leave discolouration ?
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Week 6
Leaves. Color · Dark-brown
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Mattn
Mattnanswered grow question 3y ago
To me it looks like phosphorus deficiency. Most likely due to pH too high.
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Advice please :)This is 24 hours later. Should I just give some calmag now even tho the soil is still damp?
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