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Prediction of Trifluralin Diffusion Coefficients

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:
Agr. Res. Serv., 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:
Agr. Res. Serv., 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:
Agr. Res. Serv., 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:
Agr. Res. Serv., 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

In the range of 4.4 to 49 C, there is an exponential relationship between temperature and trifluralin (α,α,α-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) diffusion coefficients. Diffusion is low in air-dry soil for all temperatures. It increases to a maximum value when the soil has between 8 and 15% w/w soil moisture content and then decreases steadily as moisture content increases. When the air-filled fraction of soil void space is reduced below approximately 40% v/v by either compression or addition of moisture, diffusion begins to decrease. An equation was developed to predict trifluralin diffusion coefficients from a factorial experiment with seven soil moisture contents, five soil temperatures, and two bulk densities. Diffusion coefficients range from 3.8 X 10-11 cm2/sec to 2.8 X 10-6 cm2/sec. Fifteen terms are required in the prediction model to describe accurately the response surface of trifluralin diffusion coefficients. With the equation it is possible to predict trifluralin diffusion coefficients for any combination of measured soil parameters as long as they are represented by the range of the variables used in the experiment.

Type
Research Article
Information
Weed Science , Volume 21 , Issue 5 , September 1973 , pp. 485 - 489
Copyright
Copyright © 1973 Weed Science Society of America 

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References

Literature Cited

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