We have had a great response from our 15 gallon post, so we decided to answer your questions here in an informative post regarding building a living soil for bigger batches in containers or outdoors!
Generally speaking, you want to apply amendments at a rate of 1/2 cup per 1 cf of dry soil mix. You dry soil mix should be:
Equal parts aeration (pumice, lava rock, perlite, growstone), homemade compost (preferably homemade EWC) and sphagnum peat moss.
1 cubic foot = approximately 6.5 gallons of dry soil
5 gallon container: 1/3 cup amendment of each
7 gallon container: 1/2 cup amendment of each
15 gallon container: 1 cup amendment of each
Fish Meal 9-4-0
Nitrogen, phosphorous, amino acids, hormones, etc.
Crab Shell Meal 4-3-0
Nitrogen, Phosphorous, Calcium, Magnesium, pH buffer, chitin, etc.
Oyster Shell Flour
Calcium, pH buffer
Kelp Meal 0-0-1 or 1-0-2
Potassium, abundant trace minerals, etc.
This post was written by sperling