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Runoff losses of cyanazine and metolachlor: effects of soil type and precipitation timing

Published online by Cambridge University Press:  20 January 2017

Stephen M. Schraer
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Box 9555, Mississippi State, MS 39762
Joby M. Prince
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Box 9555, Mississippi State, MS 39762
Michele Boyette
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Box 9555, Mississippi State, MS 39762
William L. Kingery
Affiliation:
Department of Plant and Soil Sciences, Mississippi State University, Box 9555, Mississippi State, MS 39762

Abstract

The effects of time of precipitation and soil type on runoff losses of cyanazine and metolachlor were studied using a tilted-bed, microplot system. Two silt loam soils, Bosket and Dubbs, and a Sharkey silty clay were evaluated. Rainfall (22 mm h−1) was simulated at 0, 2, and 14 days after treatment (DAT). Time of precipitation did not impact herbicide losses or any of the runoff parameters evaluated in this study. Water runoff occurred sooner and in greater quantities from the surfaces of Bosket and Dubbs silt loam soils than from the surface of Sharkey silty clay. Runoff losses of cyanazine did not vary by soil type. Soil drying produced large cracks in Sharkey silty clay, which greatly reduced runoff in this soil. Combined runoff and leachate losses were highest from Dubbs silt loam. Runoff losses of metolachlor were not affected by soil type. However, regression analyses indicated that time of precipitation and soil type interacted to affect initial metolachlor concentration. At 14 DAT, initial metolachlor concentration was highest in runoff from Sharkey soil. Time of precipitation ranked with respect to initial metolachlor concentration in runoff from Bosket and Dubbs silt loam soils were 0 > 2 > 14 DAT and 0 = 2 > 14 DAT, respectively.

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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