Add a cup of PSG and dolomite lime per cubic foot of soil.
Soul recently published the following which differs from the above:
Lately I've been happier with a bit less wormcastings:
I also mix in a cup of dolomite lime per cubic foot of soil & wet the mix with an organic tea made from dissolving a cup of PSG in a 5-gallon bucket of water.
See Soul's Guano Tea Method
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