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Washoff of Dicamba and 3,6-Dichlorosalicylic Acid from Turfgrass Foliage

Published online by Cambridge University Press:  12 June 2017

Mark J. Carroll ,
Robert L. Hill ,
Emy Pfeil  and
Albert E. Herner
Mark J. Carroll
Affiliation:
Dep. Agron., Univ. MD, College Park, MD 20742
Robert L. Hill
Affiliation:
Dep. Agron., Univ. MD, College Park, MD 20742
Emy Pfeil
Affiliation:
Environ, Chem. Lab. U.S. Dep. Agric. Res. Serv.: Natl. Res. Inst., Beltsville, MD 20705
Albert E. Herner
Affiliation:
Environ, Chem. Lab. U.S. Dep. Agric. Res. Serv.: Natl. Res. Inst., Beltsville, MD 20705
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Abstract

The functional relationships between rainfall intensities and amounts, and the washoff of dicamba and 3,6-DCSA from turfgrass foliage were determined. Dicamba was applied to Kentucky bluegrass field plots and the turfgrass was subjected to 2 to 58 mm of simulated rainfall 18 to 48 h later. Rainfall was applied at an average intensity of 20.6 or 39.9 mm h−1. The 39.9 mm h−1 intensity reduced dicamba washoff by 10% for a given amount of rainfall. Washoff of 3,6-DCSA was independent of rainfall intensity. When averaged over intensities, washoff of dicamba was best described by the equation y = 1 − 0.341x0.187, and 3,6-DCSA washoff by the equation y = exp(-0.210x), where x represents millimeters of rainfall and y, the proportion of compound remaining on the foliage after rainfall.

Keywords

Dicamba, 3,6-dichloro-2-methoxybenzoic acid3,6-DCSA, 3,6-dichlorosalicylic acidKentucky bluegrass, Poa pratensis L.Modeling
Type
Research
Information
Weed Technology , Volume 7 , Issue 2 , June 1993 , pp. 437 - 442
Copyright
Copyright © 1993 Weed Science Society of America 

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References

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