National Research Centre for Weed Science, Jabalpur, 482004, Madhya Pradesh, India.
Environ Monit Assess. 2010 Mar;162(1-4):163-8. doi: 10.1007/s10661-009-0784-1. Epub 2009 Feb 24.
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 microg g(-1). Analysis showed 0.015 and 0.005 microg 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 microg 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 microg 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.
进行了田间试验，以确定在洋葱作物的两个生长阶段中，氧氟草醚残留的持久性和生物累积性。在作物（品种 N53）上以 250 和 500 g ai/ha 的剂量喷洒了氧氟草醚（23.5% EC）。收获时采集成熟洋葱和土壤样本。从每个处理和对照小区中采集 55 天的青洋葱，并采用经过验证的高效液相色谱法分析氧氟草醚残留，在最低检测浓度为 0.003μg g(-1)时，回收率为 78-92%。分析表明，在 250 g a.i.ha(-1)的剂量下，青洋葱和成熟洋葱样本中的氧氟草醚残留分别为 0.015 和 0.005μg g(-1)；然而，在 500 g a.i.ha(-1)的剂量下，青洋葱和成熟洋葱样本中的氧氟草醚残留分别为 0.025 和 0.011μg g(-1)。收获时采集的土壤样本在 250 和 500 g a.i.ha(-1)的剂量下分别显示出 0.003 和 0.003μg g(-1)的氧氟草醚残留。建议在施药后洋葱作物的收获前间隔 118 天。
