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New York N and P Indices
New York Nitrate Leaching Index
The New York Nitrate Leaching Index (LI) is an indicator of the potential for nitrate to reach groundwater. Nitrate, because it is water soluble, moves downward as water percolates through the soil. The extent of percolation depends on soil depth to a restrictive layer, drainage characteristics and precipitation amount and distribution over the year.
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The current LI rates leaching potential based on soil hydrologic group and 30 year average precipitation data from weather stations around NY. Until recently, rainfall data were county-based. The latest version of the LI uses township-based precipitation data, which more accurately reflect precipitation patterns than the previously used county-based precipitation data. Click on the link below to access tools and information about the New York Nitrate Leaching Index.
New York Nitrate Leaching Index Information
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New York Phosphorus Runoff Index
Cornell University faculty and staff, Cornell Cooperative Extension field staff, agencies including NRCS and Soil & Water Conservation Districts, private sector crop consultants and producers have jointly developed a second draft of the New York Phosphorus Runoff Index.
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This draft version includes transport (soil drainage class, flooding frequency, distance to the stream and stream type, presence or absence of concentrated flows) and source factors (soil test P, fertilizer and manure P application rate, timing and method). Click on the link below to access tools and information about the New York Phosphorus Runoff Index.
New York P Index Information
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Photo by L.D. Geohring, 2002
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