Light burn or Pot. deficiency?

Hey everyone, been awhile since I’ve posted anything, most of the girls are looking great. This one in particular has me scratching my head though. I can’t seem to figure out of this is light/heat burn or a deficiency of potassium.

They are in a mix of FF OF and Bioflower and have been getting light doses of Cal-Mag and Grow Big from FF roughly every 3-4 weeks. I have been using either distilled water or spring water, but have not been PHing it lately.

They are roughly 3’ under a 630 CMH light.

This forum is probably the reason most of my plants have made it this far, so what can I do for this one?

Thank you!!


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Resembles a potassium and magnesium deficiency IMO Growmie. How old is the FFOF and I’m not familiar with the Bioflower medium? I would recommend watering at 6.5 to liberal run off and test the PH and PPMs in the soil. Could be a PH or low nutrient issue but the run off numbers will tell you both of these :love_you_gesture:

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I think this is around 3 months from sprout. I’ll water and check PH, I’ll have to get a PPM meter and check that as well. Thanks for the quick advice!

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The run off PH will help and let you know if it’s in range for soil. For soil a range of 6.3-6.8 with the sweet spot being 6.5 :love_you_gesture:

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