Yellow leaves??? Help??

CARmick93

Active Member
Noticed a few yellow leaves on some of my plants was just wondering if anyone knows what could be causing this? I have done some research and think it could be a nitrogen or potassium deficiency?

The plants are 7 week old autos, Pineapple Express, blueberry cheese and stardawg grown in biobizz all mix. I have been giving them nutes now for about 2 weeks, biobizz bloom and grow.

If anyone could shed any light on what’s happening and how to fix would be much appreciated.
 

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