Brand name for a fertilizer produced by the Milwaukee Metropolitan Sewerage District, the name is short for Milwaukee Organic Nitrogen. Sold commercially since 1926, it was developed as a way to dispose of biosolids extracted during the sewage treatment process of Milwaukee's then new municipal sewage system.

A slow release, non-burning fertilizer containing roughly 83% water insoluble nitrogen, Milorganite represented a major breakthrough when it was introduced, and is still widely used today.

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