Seasonal and Intra-Event Nutrient Levels in Farmed Prairie Potholes of the Des Moines Lobe Kaleita, Amy Soupir, Michelle Kaleita, Amy Soupir, Michelle
dc.contributor.department Civil, Construction and Environmental Engineering
dc.contributor.department Agricultural and Biosystems Engineering 2020-01-24T21:58:34.000 2020-06-29T22:36:56Z 2020-06-29T22:36:56Z Tue Jan 01 00:00:00 UTC 2019 2019-01-01
dc.description.abstract <p>The prairie pothole region ranges from central Iowa to the northwest into Montana and south-central Canada, totaling around 700,000 km2. This area contains millions of potholes, or enclosed topographical depressions, which often inundate with rainfall. Many are located in areas that have been converted to agricultural land through installation of artificial drainage. However, even with drainage, potholes pond or remain saturated during and after significant rain events. In this two-year study, surface water depth was collected hourly (typically from after planting through harvest) from eight farmed potholes (drained and under corn-soybean rotation) on the Des Moines Lobe in central Iowa. Nutrient data were collected daily and tested for nitrogen (N) and phosphorus (P) when inundation depth exceeded 10 cm. The data were analyzed in two ways. First, seasonal differences were investigated using samples from the first day of each inundation event. Surface water concentrations were higher in the early growing season than late season for total N (TN), NO3-N, NH3-N, total P (TP), and total suspended solids (TSS). Secondly, average event concentration changes were determined. Nitrate reductions occurred in 85% of multiday events, but these reductions were offset by increases in P. Total P and dissolved reactive P (DRP) had significant increases that averaged 0.51 and 0.46 mg L-1 per event, respectively, with event lengths of 2 to 19 days. This study demonstrates that inundated farmed potholes reduce NO3-N but serve as in-field hotspots, contributing elevated TP and DRP to drainage waters. When a surface intake directly connects inundated farmed potholes to drainage, new strategies, such as field management or engineered technologies, are needed to mitigate P export. This study is useful in informing policy regarding field management and conservation of farmed potholes.</p>
dc.description.comments <p>This article is published as Martin, Alexander R., Michelle L. Soupir, and Amy L. Kaleita. "Seasonal and intra-event nutrient levels in farmed prairie potholes of the Des Moines Lobe." <em>Transactions of the ASABE</em> 62, no. 6 (2019): 1607-1617. DOI: <a href="" target="_blank">10.13031/trans.13414</a>. Postged with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/
dc.identifier.articleid 2393
dc.identifier.contextkey 16333944
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/1107
dc.language.iso en
dc.source.bitstream archive/|||Fri Jan 14 18:41:32 UTC 2022
dc.source.uri 10.13031/trans.13414
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Farmed wetland
dc.subject.keywords Nitrogen
dc.subject.keywords Nutrients
dc.subject.keywords Phosphorus
dc.subject.keywords Prairie pothole
dc.title Seasonal and Intra-Event Nutrient Levels in Farmed Prairie Potholes of the Des Moines Lobe
dc.type article
dc.type.genre article
dspace.entity.type Publication
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relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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