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Mechanism of Trifluralin Diffusion in Silt Loam Soil

Published online by Cambridge University Press:  12 June 2017

L. E. Bode ,
C. L. Day ,
M. R. Gebhardt  and
C. E. Goering
L. E. Bode
Affiliation:
U.S. Dep. of Agr., U.S. Delta States Agr. Res. Center, Stoneville, MS 38776; Agr. Res. Serv., U.S. Dep. of Agr. and Agr. Engr. Dep., Univ. of Missouri, Columbia, MO 65201
C. L. Day
Affiliation:
U.S. Dep. of Agr., U.S. Delta States Agr. Res. Center, Stoneville, MS 38776; Agr. Res. Serv., U.S. Dep. of Agr. and Agr. Engr. Dep., Univ. of Missouri, Columbia, MO 65201
M. R. Gebhardt
Affiliation:
U.S. Dep. of Agr., U.S. Delta States Agr. Res. Center, Stoneville, MS 38776; Agr. Res. Serv., U.S. Dep. of Agr. and Agr. Engr. Dep., Univ. of Missouri, Columbia, MO 65201
C. E. Goering
Affiliation:
U.S. Dep. of Agr., U.S. Delta States Agr. Res. Center, Stoneville, MS 38776; Agr. Res. Serv., U.S. Dep. of Agr. and Agr. Engr. Dep., Univ. of Missouri, Columbia, MO 65201
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Abstract

Diffusion of trifluralin (α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) through Mexico silt loam soil was measured in diffusion cells under laboratory conditions. Radiolabeled herbicide was extracted from each sample and counted by liquid scintillation. Fick's Second Law with a constant diffusion coefficient adequately describes trifluralin diffusion regardless of concentration or diffusing time. Solution diffusion increases directly with bulk densities to 1.1 g/cm3 and then decreases. Vapor diffusion is decreased approximately 50% for every 10% decrease in air-filled porosity. Vapor diffusion contributes the major portion of total diffusion at bulk densities of less than 1.2 g/cm3. For bulk densities between 1.2 and 1.4 g/cm3, the magnitudes of vapor and solution diffusion are similar.

Type
Research Article
Information
Weed Science , Volume 21 , Issue 5 , September 1973 , pp. 480 - 484
Copyright
Copyright © 1973 Weed Science Society of America 

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References

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