Vulnerability of shallow ground water and drinking-water wells to nitrate in the United States: Model of predicted nitrate concentration in U.S. ground water used for drinking (simulation depth 50 meters) -- Input data set for farmfertilizer (gwava-dw_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 ground water used for …