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How to Make a Potassium Fertilizer. Potassium is one of the key elements of fertilizer, listed as the "K" on the "N-P-K" rating of manufactured fertilizer. Farmers have been making their own potassium-rich fertilizers through the long history of agriculture, and so can any gardener. All a gardener needs is wood ash, although...

Table of contents How to Make a Potassium Fertilizer
Things You'll Need 00:43
Tips & Warnings 02:04

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