why are my leaves turning?

Is that the ph going in or coming out? Either way thats not great. And ppm? What are you feeding?
Pine bark is also very acidic and will throw the ph of the nutrient solution out of whack . You want ph going in between 6-6.5 and coming out the same.
Thanks......I knew ceder was and not to use walnut, I didn't know pine would.
 
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