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Nugbutabi
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I don’t test run off ec only substrate ec with substrate meters because it doesn’t really give you an accurate measurement of what’s going on in your root zone I test ph with run off though and it’s at 6.0 so it shouldnt have a problem with calcium absorption. Calcium is uptaken by plants through transpiration so it helps move it through plants when your plants are transpiring is that chart for soil because ideal range for coco is 5.8 to 6.2Do you have the EC runoff reading? My suspicion is because you fed such a high EC initially of 2.5 there is now “salt build up” in the rhizosphere. But we will only know this with that Runoff test