Thats exactly how it works. Having enough to survive and having enough to reach high brix are 2 different things.
Having enough available P to haul all those exudates back down is equally as important as having enough P to haul nutrients up, and as the plant grows this amount needs to increase to both supply more nutrients and feed more microbes.
P is the main player and Ca sets the stage so P can do it's job. Once P is feeding both the plants and the microbes sufficiently the system becomes self sustaining if Ca, O2, and P remain available.
The difference between Ca and P is that you can dump Ca in and it's done, but P needs to be mined. If you just dump it in then the plant is happy with that and sees no need to pay the microbes with exudates, and brix drops to near zero, yet the plant looks fine. It just has no immunities and bugs move in. PM as well. All sorts of nasties.
So to be truly safe the only real way is to start mining P at birth. That flies in the face of stoner logic which generally dictates "veg" soil and "flower" soil. What you need is "healthy balanced" soil.
Like raising children, those that are fed a full healthy diet from birth have a better chance of a healthy adulthood and reproduction.
If you go to a fertility clinic because there are conception issues, the 1st thing they do is prescribe Vitamins (which is a contraction for vital minerals) and change your diet. They in essence raise your brix. After 6 to 8 weeks they start trying other things, but quite often the diet change does it. P is the love drug in humans too.
They need to straighten out Ca and P before trying anything else. Sound familiar?
Now that you understand brix better, go watch Rabenberg again. Take your crayons, make notes. Soilworks LLC is his channel.
Don't despair, every time you start a new round of soil your brix will be better. If you up P availability just a bit from where your current mix is at your in. Then your rich gets richer every round.
Fortify, fortify, fortify. I bet now you see why I put so much used weed into my system, it's the pefect high brix input.
If you fortify all your garden inputs then
you will really jump ahead fast. Use molasses a couple times a year on everything and make sure all your inputs have good fuzzy calcium lines and you will do really well. If they are crisp lines, spread some dolomite around.
Then all your potions get better too and all your rich get richer at once. Everything you have learned about brix isn't a weed thing, it's a plant thing. The rules apply to all.
Your mix is already borderline high brix you've done a great job on it. You just need one more step up and the spreadsheet talk a few weeks back pointed out the holes. Concentrate there and keep calcium up. Follow the refractometer, it doesn't lie.
Use it on all the leaves around your yard and fix the calcium lines as you go. Once the snowball starts rolling all you need to do is hang on and keep Ca available. I look for the calcium line before I read the number. If it's fuzzy brix are going up.
If you want to use inputs from your yard then dandelions, thistle, anything with thick milky white sap is a high Ca input. Anywhere dandelions or thistle flourish is a calcium deficient zone.
. I'm excited for you, you have held your path and your getting close. I think you have all the pieces and finally they are coming together.
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), since big showy flowers is what I'm trying to promote. Unfortunately I came to this process late and have had to increase the supply of my source plants.