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Phosphorus dynamics in tile-drain flow during storms in the US Midwest

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  • Vidon, P.
  • Cuadra, P.E.

Abstract

Excess phosphorus (P) in freshwater systems has been associated with eutrophication in agro-ecosystems of the US Midwest and elsewhere. A better understanding of processes regulating both soluble reactive phosphorus (SRP) and total phosphorus (TP) exports to tile-drains is therefore critical to minimize P losses to streams while maintaining crop yield. This paper investigates SRP and TP dynamics at a high temporal resolution during four spring storms in two tile-drains in the US Midwest. Depending on the storm, median concentrations varied between 0.006-0.025Â mg/L for SRP and 0.057-0.176Â mg/L for TP. For large storms (>6Â cm bulk precipitation), for which macropore flow represented between 43 and 50% of total tile-drain flow, SRP transport to tile-drains was primarily regulated by macropore flow. For smaller tile-flow generating events ( 6Â cm bulk precipitation). Although significant variations in tile-flow response to precipitation were observed, no significant differences in SRP and TP concentrations were observed between adjacent tile-drains. Results stress the dominance of particulate P and the importance of macropore flow in P transport to tile-drains in the US Midwest. Although only spring storms are investigated, this study brings critical insight into P dynamics in tile-drains at a critical time of the year for water quality management.

Suggested Citation

  • Vidon, P. & Cuadra, P.E., 2011. "Phosphorus dynamics in tile-drain flow during storms in the US Midwest," Agricultural Water Management, Elsevier, vol. 98(4), pages 532-540, February.
    • Handle: RePEc:eee:agiwat:v:98:y:2011:i:4:p:532-540
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    Cited by:

    1. Bjerkholt, Jarle T. & Kværner, Jens & Jenssen, Petter D. & Briseid, Tormod, 2019. "Mitigating particle and nutrient losses via subsurface agricultural drainage using lightweight aggregates," Agricultural Water Management, Elsevier, vol. 213(C), pages 1004-1015.
    2. Zimmer, Dana & Kahle, Petra & Baum, Christel, 2016. "Loss of soil phosphorus by tile drains during storm events," Agricultural Water Management, Elsevier, vol. 167(C), pages 21-28.

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