ItemWorkshop on Atmospheric Deposition of Nitrogen - Chesapeake Bay Program, Science and Technical Advisory CommitteeEntringer, Ron; Howarth, Robert (2009-02-06T14:02:29Z)Nutrient management in the Chesapeake region largely has focused on agricultural sources and on municipal wastewater treatment plants. This workshop was convened to advise the Chesapeake Bay Program on the role of atmospheric deposition as a source of nitrogen pollution to the Bay. The most recent evidence suggests that at least one third and probably significantly more of all the nitrogen that reaches Chesapeake Bay comes from atmospheric deposition, which also contributes to acid rain. Most of this deposition falls onto the landscape, and then a portion of it runs off and eventually reaches the Bay. ItemProgress Report: Understanding Sources and Sinks of Nutrients and Sediment in the Upper Susquehanna River BasinWoodbury, Peter; Porter, Mary Jane (2007-05-15T14:12:48Z)During recent decades, the amount of nitrogen flowing into surface waters and estuaries in the northeastern USA has increased 10-fold or more. In estuaries such as the Chesapeake Bay, such large increases in nitrogen are severely damaging populations of aquatic plants and animals, and also increasing harmful and toxic algal blooms. Most of the coastal waters of the USA are seriously degraded. At the global and national scale, agriculture is the major source of nitrogen pollution. However, atmospheric deposition is also a major source in many regions, and it contributes 25 percent to 50 percent of the nitrogen inputs to Chesapeake Bay. The Susquehanna River is the largest river east of the Mississippi in the USA, the largest tributary of Chesapeake Bay, and the single largest source of nutrients to the main stem of the Bay. Therefore, better understanding of the sources and sinks of nutrients and sediment in the Susquehanna River watershed will support better management of nutrients and water quality in the Chesapeake Bay. Research is needed urgently to identify the most important targets for nutrient reductions and the most cost-effective solutions. ItemHearing on Non-point Source Pollution: The Impacts of Agriculture on Water QualityHowarth, Robert W. (2007-05-15T13:56:41Z)Congressional testimony by Robert W. Howarth, before the U.S. House of Representatives subcommittee on Water Resources & the Environment - The Impact of Agriculture on Water Quality. April 19, 2007.