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Published in J Environ Qual 24:888-892 (1995)
© 1995 American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Uptake of a Hydrologic Tracer (Bromide) by Ryegrass from Well and Poorly-Drained Soils

R. R. Schnabel*, W. L. Stout and J. A. Shaffer

USDA-ARS, Pasture Systems and Watershed Management Res. Unit, Curtin Road, University Park, PA 16802.

* Corresponding author (rrs7{at}email.psu.edu).

ABSTRACT

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.

Received for publication September 8, 1994.


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Copyright © 1995 by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America.