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Mathematical Description of Trifluralin Degradation in Soil

Published online by Cambridge University Press:  12 June 2017

Carlos C. Reyes  and
Robert L. Zimdahl
Carlos C. Reyes
Affiliation:
Dep. Plant Pathol. and Weed Sci., Colorado State Univ., Fort Collins, CO 80523
Robert L. Zimdahl
Affiliation:
Dep. Plant Pathol. and Weed Sci., Colorado State Univ., Fort Collins, CO 80523
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Abstract

Degradation of trifluralin in four soils, each represented at four sites, under field conditions was determined quantitatively and described mathematically. A biexponential equation that resulted from integration of first-order and second-order differential rate equations described degradation data better than the first-order kinetic model for 15 of 25 soil-site combinations. Biexponential model regression coefficients indicated extent of degradation and that degradation is rapid at initially high trifluralin concentrations but slows as concentration decreases. The first-order kinetic model initially underestimated but ultimately overestimated degradation of trifluralin, thereby inferring that a first-order half-life is inadequate for predicting trifluralin persistence.

Keywords

Trifluralin2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl) benzenamineHerbicide degradationkinetics
Type
Soil, Air, and Water
Information
Weed Science , Volume 37 , Issue 4 , July 1989 , pp. 604 - 608
Copyright
Copyright © 1989 by the Weed Science Society of America 

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References

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