Here is a recipe for basic super soil. Can use in containers or beds. In containers, I would add perlite.
8 large bags of high quality organic potting soil. Amend about 20% coco-coir into soil if not already in the mix. If the mix does not already contain mycorrhizae, add mycorrhizae per package instructions. This is your base soil.
25 to 50 lbs. of organic worm castings.
5 lbs. steamed bone meal.
5 lbs. of high phosphorous bat guano ("bloom").
5 lbs. blood meal.
3 lbs. rock phosphate.
3/4 cup of epson salts.
1/2 cup azomite (trace elements).
1/2 cup of sweet lime (dolomite).
2 tbsp powdered humic acid.
Mix ingredients well.
You may use straight away. I usually put in a clean trash can with a cover and let it "cook" a few weeks.
You should not have to add any amendments during the season. Just water and GROW.
How much ground for this formula? I've got close to 2500 square feet in my garden. I have added at least 3 pallets of potting soil. It's been years trying to get my soil dark.