Vulnerability of shallow ground water and drinking-water wells
to nitrate in the United States: Model of predicted nitrate
concentration in shallow, recently recharged ground water --
Input data set for farm fertilizer (gwava-s_ffer)
This data set represents the average annual nitrogen input from
commercial fertilizer applied to agricultural lands, 1992-2001,
in kilograms per hectare, in the conterminous United States.
The data set was used as an input data layer for a national
model to predict nitrate concentration in shallow ground water.
Nolan …