Biochar soil mix ratio. How much biochar to add to how much soil?

I make the soil mix I use for all my gardening.

I start with the recommended ratio so you may see what that looks like in a practical application.

The 'recipe' for this mix:
1 cubic foot of soil.
12 quarts volume of Biochar.
5 gallon volume of loose compost (cold composted leaf/grass)

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