surface runoff

Antonio Mallarino, Matthew Helmers, Richard Cruse, John Sawyer, Dan Jaynes 

Amounts and Forms of Dissolved Phosphorus Lost with Surface Runoff as Affected by Phosphorus Management and Soil Conservation Practices
Funded by the Iowa Nutrient Reduction Strategy

Water quality evaluation of Prairie Strops across Iowa
Funded by the Iowa Nutrient Reduction Strategy

Issue: The STRIPS project (Science-based Trials of Rowcrops Integrated with Prairie Strips) conducted at Neal Smith National Wildlife Refuge near Prairie City showed integrating tallgrass prairie vegetation into row-cropped watersheds can provide water quality benefits and increase biodiversity across several taxa. Because these studies were conducted on small watersheds at one location, there is a need to evaluate the water quality benefits of prairie strips when implemented on a full-farm scale across various locations in Iowa.

Impacts of cover crops on phosphorus and nitrogen loss with surface run off
Funded by the Iowa Nutrient Reduction Strategy

Issue: Cover crops are a recognized conservation practice to reduce soil erosion, and Iowa research has shown a winter cereal rye cover crop greatly reduces nitrate loss with subsurface drainage. However, little research has evaluated the impact of cover crops on total and dissolved nitrogen (N) and phosphorus (P) loss with surface runoff.

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