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Journal of Environmental Quality Abstract -

Uptake of a Hydrologic Tracer (Bromide) by Ryegrass from Well and Poorly-Drained Soils


This article in JEQ

  1. Vol. 24 No. 5, p. 888-892
    Received: Sept 8, 1994

    * Corresponding author(s): rrs7@email.psu.edu
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  1. R. R. Schnabel *,
  2. W. L. Stout and
  3. J. A. Shaffer
  1. USDA-ARS, Pasture Systems and Watershed Management Res. Unit, Curtin Road, University Park, PA 16802.



Ryegrass (Lolium perenne L.) accumulated an average 32% of applied bromide (Br) in aboveground biomass. Bromide uptake was greater on a well-drained soil (38%) than a poorly drained soil (27%). Uptake was also affected by an interaction between season and N fertility. Bromide concentration of ryegrass was affected by interactions between soil drainage and season, and between soil drainage and N fertility. The magnitude of uptake shows Br to be quite biologically reactive in the soil root zone. The impact of interactions between common experimental variables on Br uptake makes it difficult to select settings where Br uptake will be low. Consequently, the amount and pattern of uptake among common experimental variables greatly restricts the settings in which Br is an appropriate hydrologic tracer.

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