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ARS Home Midwest Area West Lafayette, Indiana National Soil Erosion Research Laboratory Research





- Williams, Mark
- Water Availability and Watershed Management (211)
- Soil and Air (212)

Research Project: **Location:
                            National Soil Erosion Research Laboratory** Project Number: 5020-12130-004-007-I
                        
                        Project Type: Interagency Reimbursable Agreement Start Date: Mar 1, 2020
                        
                        End Date: Sep 30, 2024 **Objective:**
                        
                        The overall objective of the research is to utilize a multidisciplinary approach that includes analysis of an extensive edge-of-field dataset, laboratory experiments, and field to watershed scale assessment to better understand the delivery of legacy phosphorus (P) to Lake Erie and to provide improved recommendations for P management in the Western Lake Erie Basin (WLEB). **Approach:**
                        
                        The research will consist of five different approaches for better understanding the loss of legacy P:
1. Estimate the relative contributions of recently applied and legacy P to edge-of-field P loading using data analysis techniques and an extensive dataset from 46 agricultural fields located in the WLEB and surrounding region.  
2. Quantify P desorption from agricultural soils and ditch sediments in flow-through laboratory experiments to determine the kinetics of legacy P loss as a function of soil test P concentration and flow rate.
3. Determine the effect of a P ‘hotspot’ on P concentration and loading at the field and watershed scale by building up soil test P levels within a small, select area of each.  
4. Assess the utility of phosphate isotopes to distinguish between recently applied and legacy P sources in laboratory soil column experiments and potentially employ at field and/or watershed scales.
5. Examine the fate of dissolved and particulate phosphorus in agricultural drainage ditches through laboratory and field experiments.


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