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I will experiment next watering and give half the plants watering in that range. Its just that most sites recommend between 6.5-6.8 for soil.6.61 is too high... you will surely continue to starve your plants at this rate. 6.2-6.3 is correct in FF soils. The pH of your runoff in soil is meaningless... yes, of course it is acidic. Don't believe the naysayers on the internet who tell you that this measurement is even important, they are charlatans and it is not.