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Modeling the effect of perennial crops on subsurface discharge and nutrient loads across a range of precipitation characteristics in the artificially drained landscape of northwest Ohio, US
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| Type: | Resource | |
| Storage: | The size of this resource is 175.8 KB | |
| Created: | Sep 21, 2026 at 5:29 p.m. (UTC) | |
| Last updated: | Sep 21, 2026 at 6:09 p.m. (UTC) | |
| Citation: | See how to cite this resource |
| Sharing Status: | Public |
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| Views: | 74 |
| Downloads: | 6 |
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Abstract
Precipitation projections for the Western Lake Erie Basin watershed indicate an increase in amount and intensity by the mid-21st century. These changes have the potential to offset the hydrologic gains made through agricultural conservation practice adoption, such as perennial cropping systems. The goal of this study was to assess how changes in precipitation may impact the effect of integrating alfalfa into conventional annual crop rotations on subsurface discharge and nutrient loads at the field level using the Soil and Water Assessment Tool (SWAT) model. SWAT was first calibrated at the field scale using daily data from a monitored field that is representative of the dominant agricultural conditions in the Maumee River Watershed, U.S. Then, the effect of precipitation on subsurface discharge and nutrient loss in crop rotations with and without alfalfa was compared using a historical precipitation scenario (2000-2021) and three precipitation scenarios representing potential mid-century changes in precipitation amount, seasonality, and event intensity. Across all precipitation scenarios, rotations with alfalfa had approximately 10%, 50%, and 30% less mean annual subsurface discharge, NO3--N loads, and dissolved reactive phosphorus (DRP) loads, respectively, compared to rotations without alfalfa. These findings suggest that incorporating alfalfa into conventional rotations can help reduce subsurface discharge and nutrient loads under changing precipitation conditions. These findings are most applicable to poorly drained agricultural fields with tile drainage and relatively flat terrain. However, limitations in the model representation of winter soil processes, N fixation by perennial crops, and DRP transport may affect the magnitude of the estimated reductions.
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Credits
Funding Agencies
This resource was created using funding from the following sources:
| Agency Name | Award Title | Award Number |
|---|---|---|
| USDA US Department of Agriculture | None | None |
| Wisconsin Dairy Innovation Hub | None | None |
| ESGP Environmental Science Graduate Program at Ohio State University | None | None |
How to Cite
This resource is shared under the Creative Commons Attribution CC BY.
http://creativecommons.org/licenses/by/4.0/
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