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Sorption, Mobility and Degradation of Triclopyr and 2,4-D on Four Soils

Published online by Cambridge University Press:  12 June 2017

William G. Johnson ,
Terry L. Lavy  and
Edward E. Gbur
William G. Johnson
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
Terry L. Lavy
Affiliation:
Dep. Agron., Univ. Arkansas, Fayetteville, AR 72701
Edward E. Gbur
Affiliation:
Agric. Statistics Lab., Univ. Arkansas, Fayetteville, AR 72701
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Abstract

Laboratory studies were conducted to determine the relative sorption, mobility, and degradation rates of triclopyr and 2,4-D on two surface soils and two subsoils from the rice-producing areas of Arkansas. Triclopyr sorption was slightly greater than 2,4-D sorption. However, mobility of the herbicides on a given soil did not differ. Sorption of both herbicides was greatest and mobility lowest on a subsoil with the lowest pH. Triclopyr degradation rates were lower than 2,4-D degradation rates in a dark incubator. The average half life was 138 d for triclopyr and 21 d for 2,4-D. High soil moisture content (0 versus 100 kPa water tension) increased the rate of 2,4-D degradation. Triclopyr degraded more rapidly at 30 C than at 15 C. The dissipation rates of both herbicides were lowest on the soil on which sorption was greatest.

Keywords

2,4-D, (2,4-dichlorophenoxy)acetic acidtriclopyr, [(3,5,6-trichloro-2-pyridinyl)oxy]acetic acidLeachingsoil moisturetemperature
Type
Soil, Air, and Water
Information
Weed Science , Volume 43 , Issue 4 , December 1995 , pp. 678 - 684
Copyright
Copyright © 1995 by the Weed Science Society of America 

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