Help with Mel's Perfect Soil recipe

Square Foot Gardening List - http://www.flinet.com/~gallus/sqft.html

Greetings,
 
I am mixing up several batches of The Perfect Soil for the Perfect Garden from Mel's Square Foot Gardening book.
Unfortunately I only had enough wood ashes for my first batch.
 
Does anyone know if there is a substitute for the wood ash that I can purchase at a Garden Supply store?
 
I heard someone say Potash, but I thought that was for raising the Potassium level of the soil.
I've read that "wood ash can neutralize the soil making it more alkaline. The same as ground limestone does but not quite as dramatically."
 
Are the wood ashes in Mel's recipe used to raise the Potassium level or balance the pH level?
 
If I can substitute the Potash, what amount should I use to equal the 2/3 cubic foot of wood ash that is used in the recipe?
 
Thanks for any help you can give.
 
John
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