Persistence and Harvest Time Residues of Triasulfuron in Soil and Wheat Crop

Field experiment was conducted with wheat crop to evaluate persistence and harvest time residues of triasulfuron. Triasulfuron was applied as post-emergent @ 15 and 20 g ai ha⁻¹. In soil, residues persisted beyond 30 days. The dissipation of triasulfuron followed a first order rate kinetics. The study indicated biphasic dissipation with initial laster rate followed by a slower dissipation during later period. Wheat grains, straw and soil at harvest (112 days) contained residues below detectable limits (0.01 and 0.002 mg kg⁻¹).