“The application of nitrogen fertilizer in the fall or on frozen soils will be restricted to quarter-sections of land where 50% or more of the quarter-section is in an area with vulnerable groundwater and in DWSMAs that have nitrate-nitrogen concentrations at or in excess of 5.4 mg/L nitrate-nitrogen. An area with vulnerable groundwater is an area where nitrate can move easily through soil and into groundwater, contaminating drinking water sources.” – Minnesota Department of Agriculture
Vulnerable areas for Part 1 of the rule are defined as:
- Coarse textured soils based on USDA NRCS soils maps
- Shallow bedrock based on USDA NRCS soils maps; or
- Karst geology based on MN DNR map.
View the interactive Draft Vulnerable Groundwater Area Map or find the static map of your county from the list below.