Wisconsin's new practice standard, "Amending Soil Properties with Gypsum Products - Code 333" is listed in Section IV of Wisconsin NRCS's electronic Field Office Technical Guides available through Wisconsin county NRCS office websites.

Code 333 lists three distinct conservation purposes for gypsum applications, including:

  • Improve soil health by improving physical/chemical properties and increasing soil infiltration
  • Improve surface water quality by reducing dissolved phosphorus concentrations in surface runoff and subsurface drainage.
  • Improve soil health by ameliorating subsoil aluminum toxicity.
  • Improve water quality by reducing the potential for pathogens and other contaminants transport from areas of manure and bio-solids application.

Where practice applies

In Wisconsin, the gypsum practice has been set as an interim practice in the Great Lakes Restoration Initiative areas only. This area covers parts of four counties (Outagamie, Brown, Winnebago and Calument) in the Lower Fox Watershed.

Code 333 provides details about recommended application timing, application rates and other management strategies. Check out information about Glacierland Resource Conservation & Development Field Day.

The Wisconsin NRCS documents also includes a detailed Agronomy Technical Note with criteria for gypsum rates, site eligibility and other technical criteria.

Factsheet.  For more information, visit your local NRCS office.

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