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Old February 24, 2012   #4
fortyonenorth
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Join Date: Jan 2010
Location: NW Indiana
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I'm going to go out on a limb here but, why don't you use fertilizer - say, Potassium sulfate or chloride? There are obviously other ferts available, but these are relatively pure sources, if that's what you're looking for. You wouldn't need much. If you don't want to buy it, I would bet you could convince your local garden center to donate some for your experiment.

I don't have any hard facts on the banana peel idea, but just because there is potassium in a peel doesn't mean it will break down and become easily available to the plant during a short period of time.
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