Estimates of nitrogen-fertilizer sales for the conterminous United States in 1988
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This coverage contains estimates of nitrogen-fertilizer sales for the
conterminous United States in 1988 as reported by the U.S. Environmental
Protection Agency (1990) and by Jerald Fletcher (West Virginia University,
written commun., 1992). Nitrogen-fertilizer sales estimates in this
coverage are reported for each county polygon in tons of actual nutrient
sold (inorganic nitrogen, phosphate, and potash) as distinct from total
tons of fertilizer product.
The data are summarized for fertilizer years (i.e. the 1987 fertilizer
year runs from July 1, 1986 to June 30, 1987).
The polygons representing county boundaries in the conterminous United
States, as well as lakes, estuaries, and other nonland-area features were
derived from the Digital Line Graph (DLG) file representing the
1:2,000,000-scale map in the National Atlas of the United States (1970).
Nitrogen-fertilizer
Commercial fertilizer
Fertilizer use
Counties
United States
创建时间：
2016-10-29
