Terminal Residues of Imazethapyr in Soybean Grains, Straw and Soil

Imazethapyr, a post-emergence herbicide, was applied at 100 g ai ha⁻¹ 25 days after sowing of soybean crop for managing annual and perennial broad-leaf weeds and sedges. Terminal residues of imazethapyr were determined in soybean grains, straw and soil. Soil and crop samples were analyzed by HPLC using photo diode array detector at 250 nm. The retention time of imazethapyr was found to be 3.5 minutes. The residue level of imazethapyr in soil, soybean grains and straw was found 0.008, 0.102 and 0.301 μg g⁻¹ respectively.