County-Level Estimates of Nitrogen and Phosphorus from Commercial Fertilizer for the Conterminous United States, 1987-2006
This data set contains county-level estimates of nitrogen and phosphorus from fertilizer, 
for both farm and nonfarm uses, for the conterminous United States, for 1987 through 
2006. State-level farm and nonfarm nitrogen and phosphorus were derived from the 
Association of American Plant Food Control Officials …