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Tillage System Effects on Atrazine Loss in Surface Water Runoff

Published online by Cambridge University Press:  12 June 2017

Brian L. S. Olson
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
David L. Regehr
Affiliation:
Department of Agronomy, Kansas State University, Manhattan, KS 66506
Keith A. Janssen
Affiliation:
East Central Kansas Experiment Field, Ottawa, KS 66067
Philip L. Barnes
Affiliation:
Department of Biological and Agricultural Engineering, Kansas State University, Manhattan, KS 66506

Abstract

Atrazine detection in drinking water has raised questions about how to reduce levels of this herbicide. Field experiments were conducted near Ottawa, KS, to determine atrazine levels in runoff from grain sorghum grown under three tillage systems in three growing seasons. Atrazine at 1.12 kg ai/ha was applied several weeks before planting to areas where no-till (NT), ridge-till (RT), and chisel-disk (CD) systems were used, followed by an additional 0.56 kg ai/ha applied at planting. Surface-water runoff was collected from enclosed metal frames within each tillage system, and total water runoff and atrazine concentration were determined and used to compute total atrazine loss. Atrazine loss was less from CD than from the other tillage systems in years when atrazine was soil incorporated. Atrazine loss was highly variable among years and tillage systems. This suggests that other factors besides till systems influenced atrazine runoff.

Information

Type
Research
Copyright
Copyright © 1998 by the Weed Science Society of America 

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