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This article in JEQ

  1. Vol. 3 No. 3, p. 262-265
    Received: Sept 4, 1973

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Degradation of Trifluralin in Soil Suspensions as Related to Redox Potential1

  1. G. H. Willis,
  2. R. C. Wander and
  3. L. M. Southwick2



A system for controlling redox potential in soil suspensions was used to investigate the relationship between oxidation-reduction potential (Eh) and the rate of trifluralin (a-a-a-trifluoro-2,6-dinitro-N,N-dipropyl-p-toluidine) degradation. Redox potentials of +450, +250, +150, +50, 0, and −50 mV were imposed on trifluralinamended (1 ppm oven-dry weight soil basis) soil suspensions (100 g soil in 300 ml H2O) for 21 days. Results indicated that exclusion of O2 by soil flooding initiated rapid trifluralin degradation only when the Eh decreased below a critical range between +150 and +50 mV. There was no clear-cut relationship between trifluralin degradation and microbiological respiratory activity (CO2 evolution).

If soil flooding is to be a practical cultural technique for accelerating the rate of degradation of persistent pesticides, steps may have to be taken to ensure that soil Eh decreases below a critical value for some required period of time. This may include soil incorporation of a readily available carbon or energy source to stimulate an active soil microbial population to enhance lowering of the soil Eh.

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