Source: https://www.mda.state.mn.us/chemicals/fertilizers/nutrient-mgmt/nitrogenplan/mitigation/wrpr/wrprpart1.aspx
Timestamp: 2017-12-15 21:26:50
Document Index: 477161905

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Home > Ag Chemicals & Fertilizers > Fertilizers > Nutrient Management > 2015 Nitrogen Fertilizer Management Plan > Mitigation > Nitrogen Fertilizer Rule > Part 1 of the Rule
Draft Nitrogen Fertilizer Rule: Part 1
The Nitrogen Fertilizer Rule (Rule) contains two parts, each containing separate criteria and requirements. How the Rule applies to a field is dependent upon the field location. The Rule may apply in one part, both parts, or not at all.
PART 1: Use of nitrogen fertilizer in vulnerable groundwater areas will be restricted in the fall and on frozen soils
The application of nitrogen fertilizer in the fall or on frozen soils will be restricted in areas with vulnerable groundwater. An area with vulnerable groundwater is an area where nitrate can move easily through soil and into groundwater. The criteria used to determine vulnerability includes the saturated hydraulic conductivity of a soil (Ksat≥ 10 micrometers/second, roughly 1.4 inches/hour), near-surface bedrock and karst geology. Ksat is a physical property of the soil and is widely used by soil scientists to describe the soil's capacity to transmit water. Because Part 1 of the Rule is based on soils and geology, the area covered by the Rule is not subject to change over time. A field in a vulnerable groundwater area will always be subject to Part 1 of the Rule. The map shows where the Rule may apply. Areas in brown are considered the most vulnerable to pollution.
How was this map created? Is my field in a draft Vulnerable Groundwater Area?
Use an interactive map to view individual sections. Use the Draft Vulnerable Groundwater Area boundaries to determine the areas subject to Part 1 of the Rule.
In areas where more than 50% of the section has vulnerable groundwater, fall and frozen soil application will not be allowed in the entire section.
If less than 50% of the section has vulnerable groundwater, fall and frozen soil application is restricted on fields with karst or near surface bedrock or where the predominant soil type is vulnerable.
There are a few exceptions to the restriction.
establish small grains,
fertilize pasture,
apply phosphorus fertilizers (MAP, DAP) and other micronutrients that contain nitrogen; the overall applied nitrogen rate must not exceed 20 pounds per acre,
conduct agricultural research on areas 20 acres or less in size.
Draft Nitrogen Fertilizer Rule Language (PDF: 694 KB/27 pages)