Any clue why i have so much yellowing? Its only on my two bigger autos. The other younger autos look good. There in ocean forest/happy frog mix. Feed recharge and fox farm nuts every other feeding. Ph to 6.5. Any help?
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Auto's can be sensitive so you usually feed them less nutrients, but your girls look hungry to me. Are you using RO water? Might just need CalMag.
For the runoff question, just water until it comes out the bottom of the pot then collect some of that water and use your PH meter on it.
Is the 6.5 pH the runoff measurement or the pH of the water/nutrient solution going into the medium? Also, what is the PPM of the soil runoff?