PO 60: Understand the nitrate Leaching Index (LI) principles and interpretations.

The nitrate Leaching Index is an indicator of the potential for nitrate to reach groundwater.  The current LI rates leaching potential based on soil hydrologic group and precipitation data.

  • LI < 2: low risk of nitrate leaching below the root zone
  • 2 < LI < 10: intermediate risk of nitrate leaching below the root zone
  • LI > 10: high risk of nitrate leaching below the root zone

To meet the N leaching requirements of the NRCS Nutrient Management Standard (590), producers are expected to implement Best Management Practices (BMPs) if the LI score for a field is high, and to consider BMPs if the LI score is intermediate.  Sample BMPs are discussed in PO 61.

sample picture 22.JPG

NY soil types and hydrologic groups can be obtained from the New York Nitrate Leaching Index (particularly here and here.

 

 

 


return to top | previous page | next page