prospero
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Hi folks. This is my 1st coco, but my 3rd indoor grow. My question is "Should the ph in my runoff lower as I flush with lower ph water. I am setting ph to 5.7 -5.8 but getting runoff 6.1 - 6.2 even as high as 6.3. I tired flushing 1 plant and 40 litres only moved it from 6.2 to 6.1. I have noticed some yellow spots on lower leaves and am thinking it could be manganese deficiency as its only available around 5.6 - 5.7. I am growing 6 plants in 4 × 4 x 6 ft tent running 600 watt dual spectrum lamp. I am using general hydroponics trio + Calmag.
Help much appreciated. Thanks in advance.