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Granite rock dust as a plant fertilizer,jul 09, 2014 granite rock dust as a plant fertilizer. july 2014 by wojciech majda comment. over a century ago granite rock dust was accidentally used by julius hensel as a fertilizer in his vegetable garden. He worked as a miller and some stones got milled while he was milling flour. As he needed to dispose of this waste he put it in his garden.

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