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Atmospheric nutrient (nitrogen and phosphorus; N and P) loading and transport through precipitation and dry deposition is one of the least understood and may be one of the most important

The use of antibiotic agents in fields other than human treatment has grown rapidly over the past few decades. Currently, the veterinary use of antibiotics accounts for approximately 40-50% of

Impaired surface water and West Nile Virus (WNV), two issues that are critically important to Iowans, may be interrelated. High levels of nutrients and other agricultural chemicals that contaminate surface

Surface water quality is currently one of the most important environmental issues facing the state of Iowa since the ecological and recreational health of water bodies are threatened by non-point

Sediment and phosphorus loading of streams are major impairments of surface water sources in Iowa. While production of perennial forages may limit sediment and phosphorus losses in precipitation run-off, sediment

In the mass production of livestock, veterinary antibiotics are extensively used for disease control and growth promotion. One of the major users of veterinary antibiotics is the swine industry. Recent

Sediment fingerprinting via stable isotopes relies upon the premise that the physical and chemical properties of sediment will reflect its provenance. Sediments from different sources in most cases have different

Movement of water and nutrients though subsurface drainage systems is a concern in many Midwestern agricultural watersheds, including the Des Moines Lobe of Iowa. Although subsurface drainage has its benefits–it

Vegetative filters are a best management practice used for the removal of sediment and other pollutants from overland flow from agricultural watersheds. Although there has been a significant number of

Many questions related to the impact of current phosphorus (P) management practices on P-related water quality problems are being asked by the public, government agencies in charge of nutrient regulations,