Here is the soil recipe I used for my last batch of soil. I started off with the basic Sub-Cool soil recipe found in old 420 magazine article. After hanging around sites like this and reading various articles about microbes, giant pumpkins etc. it grew to this.
As with any good recipes it starts with worm casting, compost, and a aeration agent. I use to make my own compost but my health isn’t the greatest and bagged is just to much easier not to use. As far a aeration agent I choose rice hulls because they do a good job and are a waste product that will break down in the soil supplying silica for the soil.
These are the basic ingredients as found in sub-cools recipe I changed up with the fish bone meal and added the crab meal after read about it fooling the plant into thinking there is a insect attack and raising defense.
Here is the cal-mag I also use egg shells for a slow calcium breakdown besides just being a basic garden admendment.
Here are some extras I put small amounts in the mix just to have alot of different good stuff in the background. The Azo is from sub- cool the rest are from various grows and soil mixes I’ve read about. I use a lot of kelp people love kelp.
After reading about the benefits of fungus for the roots I use three different grains for different types of fungus no real science behind it just throwing everything against the wall.
I add these two along with the rice hulls to add silica to the grow. Found this addition to the soil is very beneficial for frost. Learned this growing from clones in hydro and adding this to my regimen made a big difference in strength of branches and frost in the flowers.
Mix enough soil and this becomes your good friend. I start of my mixing by putting all of the additives in the mixer and adding 5 gallons of soil letting it mix for 10 minutes, then I add 2 more run for another 5 min then I bring it up to total 10 gallons let I run another 5 min. Then I add in the last 5 gallons, and let it run another 10 min. I doubt how well the mixer mixes when it’s this full thats the reason for slow step up.