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My bad, you say per cubic foot. I'm spaced out. Sounds like your ph readings are accurate, good tools and methods.
Either way, seems like a ton of lime to me. I am not to knowledgeable on the other stuff (or anything), but if you can add more soil mix without any lime, I think it would help a lot. Imo ideally 1/4 current - nearly 0 lime. I've seen a lot of people suggesting to use so much lime, I just don't think it's good.
Could be the rock dust, I never add much since expensive and I assume it's only for micros, so not much is needed and never tested it's effect on ph. I also use glacier rock dust which may be different. Just did a quick look into your rock dust and it says it need 5.5 ph or lower to be effective.
My current soil mix has lime (it's premix plus what I mixed in, so I have no idea how much lime and I added a cup-half cup to 40 gallons), but I think I wont be using it anymore (sprinkle only for micros nutes), just because to much affect on ph and I don't know how long it last but I believe maybe just 1 grow, give or take. I want as stable as possible ph, just off soil mix base ingredients (anything ~10% or more of mix). Any additives after that, just for ~feeding soil, hopefully very little effect on ph.
The lime is the only thing that stands out to me but I am not even 'novice' gardener. Imo, lime is best used for micros, so not much needs to be used.
I use gypsum too, same as lime, just sprinkle, 1cup -1/2 per 40 gallons. Again, just because I think it adds some micros.
I guess you may already be thinking this but if not, make sure ph is perfect before planting anything.
Note: I have only brought 1 plant to harvest using what I say above, but all seems well and more plants getting close to harvest with it. All cannabis grows before were hydro.
Lastly, what you could do in with the plants in high ph soil MAYBE, is to use something to lower the ph of the water you water the plants with. It could help, maybe not. From my experience soil is very diffulcult to change the ph of with this method, so it's a last resort, if it even is a resort.
Thanks for all the input! Now that i re-read all my notes feeling what you said resonated something, I did find i had a note mentioning I had gone twice the amount of lime I was meant to additional to overdoing the rock phosphate... all makes much better sense now .
next mix I prepare cannot go wrong, but first I want to finish those 15 gallons of this first trial mix as it is before I leave my current home in around 2 months. After all, the mix has already actually proven to work well on friends' photo plants with just plain water during 1-1.5 month vegs and a few EWC teas / leachate during flower... it is still something I need to test and see for my self in my own tents, though. So, we will soon see if it works for me as well or how bad the extra rock phosphate and lime do for me with the new mum and the soon-to-be-reversed clone that are now in 100% mix of it. I expect to learn tons more from this mix and future runs... I'm the kind of person who learns better from mistakes and the few ones I've made so far with this mix have taught me a lot.
Anyhow, the next mix I prepare should be the one for the no-till tests and -hopeffully- will have a much better initial pH. And that mix... I expect to be preparing it on February next year once I have completely moved out from this current place, so still got time to see how bad things go with bit a higher than recommended pH.
Oh, and the revegging plant behind the new-mum and the backup clone is a Raspberry Diesel from HSO recently grown by a friend in his minicab using coco and lettuce hydro nutes... turned out to be quite an outstanding pheno in all areas and he was going to kill it!!! I couldn't bear the thought and seeing he had left some tiny budsite alive, I asked him to let me reveg it.