The growth response of oat (Avena sativa L.) was used to detect triallate (S-(2,3,3-trichloroallyl) diisopropylthiocarbamate) residues in soil incubated at different moisture levels. When the soil was
incubated at saturation moisture condition, triallate retained some activity for 30 days even at the lowest rate of application (0.15 kg/ha). Triallate degradation seemed rapid at field capacity moisture levels.
Extreme soil moisture conditions favored triallate persistence.