If stuff that contains calcium is Out of your soil, what's In there? And more specifically, what do you use for Phosphorus?
Base is 40% peat/40% perlite/20% compost. Basalt is my sole mineral input. Only organic inputs I mix into the soil are Neem Meal and Kelp Meal, that's it. Those two ingredients cover all the bases for me, in conjunction with a product called TM-7.
4 weeks before flower, I used to use Down to Earth's Organic Rose and Flower Fert as a top dress covered with compost. Nice light 4-8-4 NPK, good ingredients, and DtE products have never failed me.
I since moved on to a new product, forget the name of it, but my local Ace Hardware had it. Instead of paying $20 per 5lbs of Rose and Flower mix, I'm not paying $17 for a huge 15 lb bag of this stuff. I'll get the name of it when I go back outside tomorrow, caught my eye because the ingredients are light, NPK is like 3-8-4 or something like that, and is much cheaper.
~4 weeks prior to flower, I top dress with a flower oriented blend, Karanja Meal, then cover both with compost. I do this every 1-2 weeks, unless I'm outdoors. Some plants outdoors require 1-2 top dresses per week. Karanja has zero NPK, I only use Neem Meal when I first make the soil or as a top dress when the plants are in veg.
Guano can be used for P in a pinch, under two conditions. 1) Its used sparingly, so as to avoid burn from how quickly it decomposes. 2) The P is <8. More than 8 phosphorus in your NPK hurts more than it helps, certain fungi cannot live in soils too high in Phosphorus and this isn't including the potential issues with lock out if your soil has too much P in it.
I strongly favor the flowering mixes I listed above over Guano, no worry about burning your roots with those, so I can apply them liberally and the only consequence is potential diminishing returns. But, for $17 per 15 lbs, diminishing returns isn't the biggest concern.
Can you post the results of that water test?
I'll see if my wife remembers where it is and share if its found. Lots of limestone where I live.
How are you removing the calcium from your water? I thought of installing an RO system myself, but the amount of waste water kind of turned me off TBH. I've been thinking of a little rainwater catch system though.
Removing the Ca from my water would prove too expense, and as you said, the waste.
Rather than attempting to remove the Ca from my water, I simply worked with it and use it to my advantage now. I eliminated Crab Meal, Gypsum, and OSF from my mix and problem solved. I have zero buffering agents in my soil, the water buffers the soil for me. Which is still an absolute mindfuck to think about for me.
Was hard to notice at first, because the issues would always arise in flower for me. But that's because of the amount of water used in flower compared to seedling/veg stages.
Removing every trace of Ca from my soil fixed all of my issues.