Help Yellow spots on my leaves

terraferma69

terraferma69

Member
I needd help with my first grow. I'm growing 6 Jack Flash plants in a NFT hydro.
they are about 2 weeks old and 2 of the plant have started tio develop yellow spots. My PH is 5.8 and they are under 24/0 lighting conditions. I was thinking it is a lack of magnesium but i would like to hear what experianced growers think.
 

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Are you using R/O water? The r/o process removes Calcium and Magnesium so you need to add it if you don't already.

Pics below are a calcium deficiency.

Early development
11341134calcium-start2.jpg


Late development
1134calcium-1.jpg



If that doesnt help you check out the links below, the first one is where I pulled the pics above from.

http://www.icmag.com/ic/showthread.php?t=11688
https://www.rollitup.org/general-marijuana-growing/1469-marijuana-plant-problems-cures.html
 
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