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Scientists surprised at persistence of nitrate from dated experiment

nitrate pulse to depth was also compared to stream flow records. The results provided three independent lines of evidence; all suggesting that water carrying the nitrate takes decades to flow through the subsurface of the watershed to the stream.

"We wanted to show the recommended cropping-system treatments begun in 1996 could improve water quality, but we won't be able to do that by monitoring this stream, because the newer experiment is confounded by a persistent effect of past research. While this is disappointing, the lesson we have learned about how patient we must be in conducting research on agricultural pollution is eye opening,"

Results of the study are published in the November/December 2003 issue of the Journal of Environmental Quality. Subscribers can access the full article; nonsubscribers can access the abstract, or pay a $5 per-article fee, or buy a $15, 14-day site pass, at: http://jeq.scijournals.org/cgi/content/abstract/32/6/2158.


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Contact: Sara Uttech
suttech@agronomy.org
608-273-8080
American Society of Agronomy
10-Dec-2003


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