S. Sondhia
Apr 1, 2009
Citations
2
Influential Citations
30
Citations
Journal
Toxicological & Environmental Chemistry
Abstract
Oxyfluorfen is a post-emergence herbicide used for control of annual and perennial broad-leaf weeds and sedges in rice. There is increasing concern about persistence of pesticide residues in soils, agricultural products and sub-sequent contamination of ground water through runoff, leaching and drift. Thus, persistence of oxyfluorfen was evaluated under field conditions in a rice cropping system. Oxyfluorfen was sprayed at 240 and 500 g ai ha−1 application rates to the rice crop as post-emergence herbicide. Paddy grains, straw and soil samples were collected at harvest and analyzed for oxyfluorfen residues by HPLC. Straw samples contained 0.01 and 0.03 µg g−1 oxyfluorfen residues at 240 and 500 g ha−1 concentrations, respectively. In the soil, 0.028 and 0.03 µg g−1 of oxyfluorfen residues were detected when applied at 240 and 500 g ai ha−1, respectively. However, in rice grains, 0.018 and 0.106 µg g−1 of oxyfluorfen residues were found in 240 and 500 g ai ha−1 treated plots. In light of the potential adverse effects of oxyfluorfen, it is important to determine herbicide levels in these crops.