Generally, compounds of this class of herbicides are not
rapidly translocated or metabolized by most plants, but
undergo diverse patterns of degradation in soil. Because
dinitroaniline herbicide metabolism in planta is very slow,
it is difficult to ascertain what levels of the metabolites
found in plants are actually formed from plantmetabolism
versus soil metabolism. In carrot (Daucus carota L.) roots,
most of the absorbed trifluralin [2,6-dinitro-N,N -dipropyl-
4-(trifluoromethyl)benzenamine]was localized in the outer
cuticular layer, with most of the residue extracted as
trifluralin, and only minor amounts of the N-depropyl
trifluralin (68).
