Interesting, some of them, but not all of them? What is the pH of your coco plants?
The soil should come limed, for your coco pots, did you lime your coco as well?
I had this issue using my well water, my well water is loaded with Calcium Carbonate (Lime). When I moved out here, I used my same soil recipe, dolomite lime included. My pH was always 7.5+, took me over a year to realize my water was alkaline, and the water mixing with the dolomite lime ensured my pH was never below a 7.5 unfortunately.
@PadawanWarrior uses Citric Acid successfully, and has for years. Perhaps he can chime in on that? I have no experience with Citric Acid.
The way I solved this was by omitting Dolomite Lime from my future soil recipes, relying on my well water to buffer the pH instead. Problem solved instantly. However, this will only work in Peat Moss based soils, and not with coco due to the different pH ranges. Peat's acidic pH (3.5-4.0) is what allows this method to work for me. If I used coco, I'd likely still be having issues due to Coco's default pH ranging from 5.0-6.0 or so.
Do you recycle your coco/soil? Do you get any scaling on your faucets at home by chance? If so, do you notice any of it on your pots?
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All that residue on the pots is from my water.
Even if the Calcium Carbonate/minerals in the water themselves are not enough to mess with pH, or cause nutrient toxicities, its the fact that they build up salts (scaling) in your soil and that is what causes issues. Many people experience this issue, and it typically doesn't manifest until the 2nd or 3rd grow in a ROLS/no-till environment. Why so delayed? Because that is how long it takes for the salts to build up and crystalize. Once this happens, you'll experience such a wide variety of issues you'll start pulling your hair out.
Hope that helps, and good to hear there are signs of recovery for your plants. All the best.
Man, I wish my dumbass would have listened to this advice. I did not, and as a result it took me multiple years to get "dialed in" because of how many strains I was growing and all the different methods I tried.
Big downside that it took 4-5 years for me to dial my grow in, but the big upside was all the knowledge I gained by trying and experimenting with so many different things. All that said, the irony is that the soil I've been making these past couple of years only has 5-6 inputs in it.