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Brown/yellow marks on leaves


Marijoohan
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Hi everyone. 

 

Can anyone one shed some light on what these brown/yellow marks are and a way to get rid of them?

I’ve read that they could be nutrient burn or the incorrect ph of the soil. But ph is between 6 and 6,5. Measured with a ph probe. And I’m giving them the minimum dose of 2ml per liter of nutrients. Giving nutrients one watering and the ph balanced the next. So alternating between the two.

 

TIA.

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