I have a recipe that I've borrowed from another site and changed it very little:
I have not tested this recipe fully. It is posted as a reference and for comments.
Im currently using it in my grow. So far it has corrected deficiencies that were in my seedlings and has cause no burn.
"Base and Seedling Mix"
4 parts Pro Mix BX or HP/ or
FFOF or FFLW or VermiFire
2 parts BigCity Hydro Indoor Premium Mix
2 parts perlite
2 parts earthworm castings
*1 cup Powered Dolomite Lime per cubic foot of above mix
If you use a 3 qt. saucepan as “parts” in the amounts given above, it equals about 1 cu. ft. of soiless mix. I use a 3qt. pan and it work perfect.
This is a base and will be used for seedlings in future.
Then add to your seedling base/mix:
1/4 cup Blood meal per cubic foot of soil mix
1/4 cup Feather Meal per cubic foot of soil mix
1 cup Bone meal per cubic foot of soil mix
1/2 cup kelp meal per cubic foot of soil mix
1/2 cup of Jersey Greensand per cubic foot of soil mix
1/4 cupBlack Gold per cubic foot of soil mix
Mix all the dry nutrients into the soiless mix MIX well and wet it, but don't soak it. Use
Liquid Karma and water @ 1 tbs./gal. Stir and mix it a few times a week for a week or two so the bacteria can get oxygen and break down the nutrients and make it available. And don't let the mix dry out for the first two weeks, keep it moist and add water as needed. It'll also have time to get the humic acids to get going and the dolomite lime will be better able to adjust the pH of your mix.
You can just add water till harvest in theory. But I will be using benificial bacteria and fungi teas /additives throughout grow.
Credit to B4M and LC at ICM.