Phosphorus transport pathways to streams in tile-drained agricultural watersheds.

  title={Phosphorus transport pathways to streams in tile-drained agricultural watersheds.},
  author={Lowell E. Gentry and Mark B. David and Todd V. Royer and Corey A. Mitchell and Karen M Starks},
  journal={Journal of environmental quality},
  volume={36 2},
Agriculture is a major nonpoint source of phosphorus (P) in the Midwest, but how surface runoff and tile drainage interact to affect temporal concentrations and fluxes of both dissolved and particulate P remains unclear. Our objective was to determine the dominant form of P in streams (dissolved or particulate) and identify the mode of transport of this P from fields to streams in tile-drained agricultural watersheds. We measured dissolved reactive P (DRP) and total P (TP) concentrations and… Expand
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Particulate phosphorus transport within stream flow of an agricultural catchment.
Monitoring of the Bog Burn drains a dairying catchment in Southland, New Zealand, and has been monitored at fortnightly intervals over a 12-mo period for suspended sediment, dissolved reactive phosphorus (DRP), and total phosphorus (TP), indicated that trapped sediment was derived from topsoil and entered the stream either through tile drainage or, to a lesser extent, overland flow. Expand
Kinetics and Modeling of Dissolved Phosphorus Export from a Tile‐Drained Agricultural Watershed
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  • Heathwaite, Dils
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  • The Science of the total environment
  • 2000
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A program of intensive, long-term monitoring allowed us to assess how nutrient export was distributed across the range of discharge that occurred at each site and to examine mechanistic differences between NO3(-)-N and DRP export from the watersheds and simple simulations showed that reducing in-stream nutrient loads by as much as 50% during periods of low discharge would not affect annual nutrient export fromThe Illinois watersheds. Expand
Sources of phosphorus exported from an agricultural watershed in Pennsylvania
Abstract Freshwater eutrophication is usually controlled by inputs of phosphorus (P). As point source controls have decreased P inputs, the relative contributions of nonpoint inputs from agricultureExpand
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Surface water nitrate (NO 3 - ) pollution from agricultural production is well established, although few studies have linked field N budgets, NO 3 - loss in tile drained watersheds, and surface waterExpand
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The controversial role of tile drainage in phosphorus export from agricultural land.
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