Application of manure nitrogen generated by cattle housed in animal feeding operations to county-wide 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.,...美国地质调查局（U.S. Geological Survey，简称USGS）正在开发SPARROW模型（SPAtially Related Regressions On Watershed Attributes），以评估各类污染物的迁移输送过程（例如……）