After day 1 in the 0–0.1 m layer, concentrations of diuron (119 g kg−1) and at razine (109 g kg−1) were detected in the highest concentrations. These herbicides were also present at 0.2–0.3 m (15 and 7 g kg−1 for at razine and diuron respectively),but diuron was only detected below broadcast treatments. The rewas also evidence (P = 0.056) of a herbicide by days post-application interaction for at razine in the 0.2–0.3 m layer, with higher at razine concentrations measured under plots applied with broadcast treat-ments from day 1 than day 21.