Clay soil, Leaching, Movement, Oxyfluorfen, Rainfall

An experiment was conducted during July to September 2007 to determine leaching behavior and movement of oxyfluorfen in clay soil under natural rainfall conditions in PVC columns which received 830.5 mm rainfall. Oxyfluorfen was applied in the soil column at 200 and 400 g/ha. After every rain leachates were collected and analyzed for oxyfluorfen residues. Oxyfluorfen movement was evaluated in the soil at various depths at the interval of 10 cm viz, 0-10, 10-20, 20-30, 30-40, 40-50, 50-60, 60-70 and 70-86 cm depths. A total of 0.226 μg/g of oxyfluorfen was recovered after 850 mm rainfall. The data indicated that oxyfluorfen may move up to 90 cm in soil profile under continuous and high rainfall conditions and thus may have potential to contaminate ground water