2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/21/2018 | 11:45 AM - 12:00 PM | THE INFLUENCE OF ELEVATED FLOWS ON NITRATE AND PHOSPHORUS EXPORT FROM TWO AGRICULTURAL WATERSHEDS | 420 B
THE INFLUENCE OF ELEVATED FLOWS ON NITRATE AND PHOSPHORUS EXPORT FROM TWO AGRICULTURAL WATERSHEDS
Excess fertilizer applied to agricultural lands is exported downstream particularly during snowmelt and spring storms. Quantifying the impact of conservation on export during high flows is challenging because storms are spatially and temporally variable. In this study, we collected bi-weekly grab samples and deployed real-time nitrate sensors at the outlets of the Shatto and Kirkpatrick Ditch Watersheds (Indiana) to compare the role of storms on nitrate and soluble reactive phosphorus (SRP) export. Water yield at Shatto was ~2x higher due to groundwater, while nitrate yield was 50% lower, and SRP yields were similar. In both watersheds, >80% of nitrate and SRP export occurred during elevated flows (>60th percentile). During peak flows (>90th percentile), nitrate export was proportionally similar to water runoff in both watersheds, while SRP export was higher than runoff in Shatto, and the two were variably related in Kirkpatrick. Real-time nitrate data revealed non-linear C-Q relationships during storms, while modeling export from grab samples overestimated annual export ~5-10%. Conservation practices that reduce nutrient loss during storms potentially improves water quality, yet watershed-specific results suggest that finding the optimal conservation recipe is difficult given the variable influence of storms.
- Landuse
- Nutrients
- Watershed
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Presenters/Authors
Jennifer L. Tank
(), University of Notre Dame, tank.1@nd.edu;
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Brittany Hanrahan
(), USDA Agricultural Research Service, br.hanrahan@gmail.com;
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Ursula H. Mahl
(), University of Notre Dame, umahl@nd.edu;
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Shannon Speir
(), University of Notre Dame, sspeir@nd.edu;
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Matt Trentman
(), Flathead Lake Biological Station, University of Montana, matt.trentman@flbs.umt.edu;
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Lienne Sethna
(), Indiana University, lsethna@iu.edu;
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Todd V. Royer
(), Indiana University Bloomington, troyer@indiana.edu;
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