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according to the RHS publication by Harry Baker ISBN 0 85533 193 3
½ ounce per square yard of sulphate of potash.
usually used copies of that book on Amazon for a few pence plus a couple of quid postage.
Oopsie, that's for the open ground. So it will depend on the size of your pots. ½ oz between 36 6" pots(that's what you would get in a squ yard) I'd weigh out the half ounce and give a good pinch per pot. If theree is any left after that, share as equally as possible between the pots.
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