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Relative Dissipation of Acetochlor, Alachlor, Metolachlor, and SAN 582 from Three Surface Soils

Published online by Cambridge University Press:  12 June 2017

Thomas C. Mueller ,
David R. Shaw  and
William W. Witt
Thomas C. Mueller*
Affiliation:
Department of Plant and Soil Science, University of Tennessee, Knoxville, TN 37901
David R. Shaw
Affiliation:
Mississippi State University, Mississippi State, MS 39762-9555
William W. Witt
Affiliation:
University of Kentucky, Lexington, KY 40546
*
Corresponding author's E-mail: [email protected]
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Abstract

The dissipation of four commonly used soil-applied herbicides was examined in a standardized field experiment in three southern states (Kentucky, Mississippi, and Tennessee). Averaged over the three soils and 2 yr, the relative order of increasing half-life defined as time for 50% disappearance in days (DT50) was acetochlor (6.3 d) = alachlor (6.3 d) = SAN 582 (7.3 d) < metolachlor (13.7 d). Metolachlor was the most persistent in the soil surface, and this could potentially translate into greater duration of weed control into the growing season. All examined herbicides had a DT50 that averaged less than 14 d in all states in both years, so full-season weed control of susceptible species would not be expected. Rapid herbicide degradation was encouraged in these field sites by adequate to excessive soil moisture and warm temperatures throughout the sampling interval. The soils also were light textured, and the lower adsorption of the herbicide allowed for degradation ease and perhaps leaching below the sampling depth.

Keywords

Acetochlor, 2-chloro-N-(ethoxymethyl)-N-(2-ethyl-6-methylphenyl) acetamidealachlor, 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamideSAN 582 (proposed common name, dimethenamid), 2-chloro-N-(2,4-dimethyl-3-thienyl)-N (methoxy-1-methylethyl)acetamidemetolachlor, 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamideDegradationdimethenamidDAT, days after treatmentDT50, time in days for 50% disappearancek, first-order dissipation rate constant
Type
Research
Information
Weed Technology , Volume 13 , Issue 2 , June 1999 , pp. 341 - 346
Copyright
Copyright © 1999 by the Weed Science Society of America 

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References

Literature Cited

Ahrens, W. H. 1994. Herbicide Handbook, 7th ed. Champaign, IL: Weed Science Society of America. 352 p.Google Scholar
Beestman, G. B. and Deming, J. M. 1974. Dissipation of acetanilide herbicides from soils. Agron. J. 66:308–311 Google Scholar
Braverman, M. P., Lavy, T. L., and Barnes, C. J. 1986. The degradation and bioactivity of metolachlor in the soil. Weed Sci. 34:479–484.CrossRefGoogle Scholar
Brown, B. A., Hayes, R. M., Tyler, D. D., and Mueller, T. C. 1996. Effect of long-term vetch (Vicia villosa) cover crop and tillage system on fluometuron dissipation from surface soil. Weed Sci. 44:171–175.Google Scholar
Chesters, G., Simsiman, G. V., Levy, J., Alhajjar, B. J., Fathulla, R. N., and Harkin, J. M. 1989. Environmental fate of alachlor and metolachlor. Rev. Environ. Contain. Toxicol. 110:1–75.Google Scholar
Littel, R. C., Milliken, G. A., Stroup, W. W., and Wolfinger, R. D. 1996. SAS System for Mixed Models. Cary, NC: SAS Institute, Inc. 630 p.Google Scholar
Mueller, T. C. and Hayes, R. M. 1997. Effect of tillage and soil-applied herbicides on broadleaf signalgrass control in corn. Weed Technol. 11:698–703.Google Scholar
Obrigawitch, T., Hons, F. M., Abernathy, J. R., and Gipson, J. R. 1981. Adsorption, desorption, and mobility of metolachlor in soils. Weed Sci. 29:332–336.CrossRefGoogle Scholar
Peter, C. J. and Weber, J. B. 1985. Adsorption, mobility, and efficacy of alachlor and metolachlor as influenced by soil properties. Weed Sci. 33:874–881.CrossRefGoogle Scholar
[SAS] Statistical Analysis Systems. 1996. SAS User's Manual, Version 3.01. Cary, NC: Statistical Analysis Systems Institute. 451 p.Google Scholar
Walker, A. 1987. Herbicide persistence in soil. Weed Sci. 3:1–17.Google Scholar
Walker, A. and Brown, P. A. 1985. The relative persistence in soil of five acetanilide herbicides. Bull. Environ. Contain. Toxicol. 34:143–149.Google Scholar
Wauchope, R. D., Buttler, T. M., Hornsby, A. G., Augustijn-Beckers, P.W.M., and Burt, J. P. 1992. The SCS/ARS/CES pesticide properties database for environmental decision-making. Rev. Environ. Contam. Toxicol. 123:1–164.Google ScholarPubMed
Zimdahl, R. M. and Clark, S. K. 1982. Degradation of three acetanilide herbicides in soil. Weed Sci. 30:545–548.CrossRefGoogle Scholar