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Mathematical Description of Trifluralin Degradation in Soil

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...

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Bibliographic Details
Published in:Weed science 1989-07, Vol.37 (4), p.604-608
Main Authors: Reyes, Carlos C., Zimdahl, Robert L.
Format: Article
Language:English
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Summary: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.
ISSN:0043-1745
1550-2759
DOI:10.1017/S0043174500072489