1. Nutrient Criteria to Protect Aquatic Life of Streams and Lakes in Intensive Agricultural Watersheds
2. Landscape controls on diffuse nutrient transfers in agricultural catchments
3. Managing Urban Stormwater Quality in a Changing Climate: Science, Engineering and Policy
4. Management Practices to Reduce Nutrient Loss from Agricultural Systems: Research Results Establishing Effective and Non-effective Conservation Practices
5. Emerging Contaminants in Groundwater and Surface Water: Selected Substances, Sources, Monitoring, Risk Assessment and Management
6. Water Quality Trading: Pre-requisite Analyses
Back to the Open Workshops Introduction
Management Practices to Reduce Nutrient Loss from Agricultural Systems: Research Results Establishing Effective and Non-effective Conservation Practices
This workshop will bring together scientists studying the response of aquatic life to excess nutrients and those scientists studying methods to reduce nutrient loading from agricultural systems. It will specifically discuss conservation practices effective in reducing the loss of nitrogen and phosphorus to water bodies from extensive and intensive agricultural practices. Discussion will be initiated by speakers from the Watershed Evaluation of BMPs (WEBs) project in Canada and the Conservation Effects Assessment Project (CEAP) in the United States. Critical questions to which answers will be discussed include:
- What general strategies (e.g., modelling, hydrologic analysis) can be applied to targeting the location and scale of nutrient-reducing conservation practices?
- Have modelling strategies been effectively calibrated to real field measurements and as to the value of scaling-up, scaling-down findings for policy relevance?
- Are there practices that reduce both P and N or can these nutrients only be reduced using different strategies?
- Are there practices that reduce both P and N or can these nutrients only be reduced using different strategies?
- What practices have resulted in reduced nutrient losses in a variety of climates, landscapes, and agricultural production systems?
- What traditional or novel conservation practices have been shown to be inefficient or ineffective (from either a biophysical or economic standpoint) in reducing nutrient losses from agricultural systems?
- How will a better understanding of watershed-scale landscape relationships help us to better predict the performance of current and possible future nutrient-reducing BMPs?
- What are the trade-offs involved in reducing surface runoff contributions vs. increasing groundwater contamination hazards?
- How important are long-term evaluations to assessing the overall effectiveness of a particular BMP or suite of BMPs at watershed scale?
Chair: Brook Harker, Agriculture and Agri-Food Canada, Regina, Saskatchewan, Canada brook.harker@agr.gc.ca
Secretary: Michael Burkart, Iowa State University, Ames, Iowa, U.S.A.
Invited Talks:
1 – Mark D. Tomer *, Lessons from CEAP: Opportunities and Challenges for Improving Water Quality Performance of Conservation Systems.
2 – Eric van Bochove **, Landscape, hydrology and agricultural practices relationships towards surface and ground waters quality improvement within WEBs watersheds.
* Research Soil Scientist, National Soil Tilth Laboratory, USDA-ARS, Ames IA
** Research Scientist, Soils and Crops Research and Development Centre, Agriculture and Agri-Food Canada (AAFC), Quebec, QC
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