Total Kjeldahl Soil Nitrogen
Source: W. W. Hargrove and R. J. Luxmoore
Map Description:
A national soil nitrogen map at 1-km resolution was developed from the May 1994 National Soil Characterization Database, linked back to the spatial information in STATSGO using soil taxonomic relationships. Soil nitrogen is high in the deep Mollisols of the midwest and in the Pacific Northwest.

Taken from the report:
A New High-Resolution National Map of Vegetation Ecoregions Produced Empirically Using Multivariate Spatial Clustering by William W. Hargrove and Robert J. Luxmoore

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