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, USGS）目前正在开发SPARROW模型——全称流域属性空间相关回归（SPAtially Related Regressions On Watershed Attributes）模型，用于评估污染物（例如……）的输移过程。