Abstract
A field study was conducted to determine persistence and bioaccumulation of oxyflorfen residues in onion crop at two growth stages. Oxyfluorfen (23.5% EC) was sprayed at 250 and 500 g ai/ha on the crop (variety, N53). Mature onion and soil samples were collected at harvest. Green onion were collected at 55 days from each treated and control plot and analyzed for oxyfluorfen residues by a validated high-performance liquid chromatography method with an accepted recovery of 78–92% at the minimum detectable concentration of 0.003 μg g − 1. Analysis showed 0.015 and 0.005 μg g − 1 residues of oxyfluorfen at 250 g a.i. ha − 1 rate in green and mature onion samples, respectively; however, at 500 g a.i.ha − 1 rates, 0.025 and 0.011 μg g − 1 of oxyfluorfen residues were detected in green and mature onion samples, respectively. Soil samples collected at harvest showed 0.003 and 0.003 μg g − 1 of oxyfluorfen residues at the doses 250 and 500 g a.i. ha − 1, respectively. From the study, a pre-harvest interval of 118 days for onion crop after the herbicide application is suggested.
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Sondhia, S. Persistence and bioaccumulation of oxyfluorfen residues in onion. Environ Monit Assess 162, 163–168 (2010). https://doi.org/10.1007/s10661-009-0784-1
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DOI: https://doi.org/10.1007/s10661-009-0784-1