Dark margins on bottom leaves?

JHake

Well-Known Member
Hello RIU.

My plants are on day 15 since switching to 12/12.

They are like 80cm/2,6ft tall.
Grow tent is 3x3 with 400W HPS.

Some bottom leaves started to fell off and noticed these dark colored margins.
 

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Thanks for the answer Renfro.
I was a little suspicious about potassium, mostly because of other elements in my grow, that i didn't write because i wanted to keep it short.

Medium is 50% peat moss, 30% perlite, 20% EWC. Amended with blood meal, bone meal and dolomite lime. Mixed, watered, and stored for 4 weeks before using it.

Went from 16oz cups to 5gal pots with the soil mix described above. 3 weeks of veg and now 15 days of flowering in those pots.
I did some fermented fruit juice from banana, squash and pumpking, after reading about korean natural farming. It's time to try it and to start looking on my local market for a K source.
I already have some mineral nutrients, will use them as a second option.
 
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