H158-08
The Risk of “One-Size Fits All” Conservation Recommendations to Improve Agricultural Water Quality

Monday, 14 December 2020: 20:58
Virtual
Merrin L Macrae1, Helen P Jarvie2, Helen M Baulch3, Jane A Elliott4, Kevin King5, Peter J A Kleinman6, Jian Liu7,8, David Allen Lobb9, John W Pomeroy10, Janina Plach11, Will Pluer11,12, Douglas R Smith13, Mark R. Williams14, Henry F Wilson15 and Martha Zwonitzer16, (1)University of Waterloo, Waterloo, ON, Canada, (2)University of Waterloo, Department of Geography and Environmental Management, Waterloo, ON, Canada, (3)Univ of Saskatchewan, Saskatoon, SK, Canada, (4)Environment and Climate Change Canada, Saskatoon, SK, Canada, (5)USDA ARS, Pendleton, OR, United States, (6)Agricultural Research Service University Park, University Park, PA, United States, (7)Nanjing Normal University, School of Geographical Sciences, Nanjing, China, (8)University of Saskatchewan, School of Environment and Sustainability & Global Institute for Water Security, Saskatoon, SK, Canada, (9)University of Manitoba, Soil Science, Winnipeg, MB, Canada, (10)University of Saskatchewan, Centre for Hydrology and Global Institute for Water Security, Saskatoon, SK, Canada, (11)University of Waterloo, Geography and Environmental Management, Waterloo, ON, Canada, (12)Cornell University, Ithaca, NY, United States, (13)USDA Agricultural Research Service Beaver, Grassland, Soil and Water Research Laboratory, Temple, TX, United States, (14)USDA-ARS, West Lafayette, IN, United States, (15)Agriculture and Agri-Food Canada, Brandon, MB, Canada, (16)Phylos Biosciences, Portland, OR, United States
Recorded Presentation
Abstract:
The eutrophication of freshwater bodies in many regions has been linked to diffuse loads of phosphorus from agricultural fields. However, the magnitude and speciation of phosphorus loss, and the partitioning of phosphorus losses between surface and subsurface pathways can vary spatially with soil texture, field slope and land use/management practices, and, temporally in response to climatic drivers, all of which can vary across regions. At present, there is a paucity of information on phosphorus loss and its associated drivers and mitigation strategies across geophysical regions with varying climatic conditions. The magnitude, speciation and flow paths of phosphorus loss occurring throughout an annual cycle across regions with varying winter severity and geomorphic conditions will be demonstrated, emphasizing the significance of the non-growing season. In addition, the efficacy of conservation practices under a range of conditions will be discussed. This presentation will draw on field studies collected in the Northern Great Plains and Great Lakes regions of North America. Spatial and temporal patterns in edge of field phosphorus losses will be discussed, emphasizing processes occurring throughout the non-growing season and highlighting the importance of individual and combined conservation practices in mitigating phosphorus losses.
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