The ph of 5.8 is too acidic, restricting Phosphorus, molybdenum and magnesium and more.
Get it to 6.2…
I can try, but why in dwc with the same water and the same parameters, everything works well?
5.8 is perfect for coco.
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What your nutrient EC???
No … not water temp… I’m talking the ambient room temp… needs to be higher… 72 73 f is not even close to enough… try getting it warmer than that… all the way up to 85 F I know you can’t boost it up to 85 f… but try to go higher than 70s.
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I’m not sure… that has me confused
What is your EC?? That looks like a Cal/mag deficiency. Maybe you need even more Calmag because of the RO water. Can you drain it all out and mix up fresh and bypass your RO filter?
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I do it every week.
Yes, it looks like cal/mag, but it’s not cal mag. As I said in the first post, I even dosed 50ml in 50 liters of water and nothing changed. And yet the mystery always remains. why does the other plant do well with the same water?
It’s not a water problem in my opinion
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You haven’t mentioned your humidity at all. What is it at? Personally, it looks like mildew or mold to my eye
Are you using the same water and PH in other tents? When’s the last time you calibrated your PH meters properly?
Yes, with good result. The problem is only here.
I have 3 ph meters, all calibrated weekly
Humidity 65/70%
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pH not balanced…try 6.0- 6.2
Root temperature also very low
Water temperature in hydro is correct, 19/20C°
I have increased my pH for 2 weeks now and there is no improvement.
The fact remains that with the same water, same pH and same temperature in dwc everything works perfectly