Application of manure phosphorus generated at cattle animal feeding operations to nearby farmland within the Pacific drainages of the United States (2012)

The U.S. Geological Survey (USGS) is developing SPARROW models (SPAtially Related Regressions On Watershed Attributes) to assess the transport of contaminants (e.g., nutrients) through the Pacific drainages of the United States (the Columbia River basin; the coastal drainages of Washington, Oregon, and California; the Klamath River basin; the Central Valley of California, and the west slopes of the Sierra Nevada Mountains). SPARROW relates instream water quality measurements to spatially referenced characteristics of watersheds, including contaminant sources and the factors influencing terrestrial and aquatic transport. Cattle manure applied to grazing land is a potential source of nutrients delivered to streams.The spatial data set “Application of manure phosphorus generated at cattle animal feeding operations to nearby farmland within the Pacific drainages of the United States (2012)” represents an estimate of the amount of cattle manure phosphorus generated at animal feeding operations (such as dairies and feedlots) in 2012 that was applied to nearby farmland around those facilities. This data set was created by estimating the total amount of manure phosphorus that was not exported to market in 2012 within each county and disaggregating that amount to the pasture and cultivated land around each AFO based on the number of cattle housed there in 2012.

                                            [
  "010:12"
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                                            {
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                                            [
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