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Old October 14, 2016   #3
Ricky Shaw
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Join Date: Aug 2015
Location: Zone 6a Denver North Metro
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I'd anticipate a drop in pH after you've fertilized, and perhaps why MSU had not flagged pH as a problem.

My source water is around 7.5 pH and after bringing it to correct strength with NPK, Cal, Mag, pH in the solution drops into an ideal range 6.2 to 6.5
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