College of Agriculture and Life Sciences Processes Controlling the Source, Movement, and Release of Soil Phosphorus in Midwestern Streams Richard Schultz, Thomas Isenhart, and Michael Thompson Iowa State University Mark Tomer and John Kovar USDA – National Laboratory for Agriculture and Environment Keith Schilling IIHR - Iowa Geological Survey USDA-AFRI Foundational Program
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Processes Controlling the Source, Movement, and Release of Soil Phosphorus in Midwestern Streams from Pasture and Crop Land
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College of Agriculture and Life Sciences
Processes Controlling the Source, Movement, and Release of Soil Phosphorus in Midwestern Streams
Richard Schultz, Thomas Isenhart, and Michael ThompsonIowa State University
Mark Tomer and John KovarUSDA – National Laboratory for Agriculture and Environment
Keith SchillingIIHR - Iowa Geological Survey
USDA-AFRI Foundational Program
Iowa Nutrient Reduction Strategy
• Stream banks are known to be a potentially large source of stream sediment.
• However, accurately accounting for stream bank sources of P is extremely difficult.
• Therefore, evaluating strategies to reduce P losses from eroding stream banks are beyond the scope of this effort.
Phosphorus Transport in Iowa Streams: The Importance of Stream Bed and Bank Erosion
Altered hydrology
Tile drainageChannelization
Severely & Very Severely Erosive Banks (USDA-NRCS, 1998)
College of Agriculture and Life Sciences
Percent Total Channel Length Classified as Erosive, by Year