Litoriya Nitesh S, Chauhan Nirmal R, Kalasariya Ravi L, Parmar Kaushik D, Chawla Suchi, Parmar Ambalal V, Raj Pratik V, Shah Paresh G
AINP On Pesticide Residues, ICAR Unit-9, Anand Agricultural University, Anand, Gujarat, India.
Main Forage Research Station, Anand Agricultural University, Anand, Gujarat, India.
Environ Sci Pollut Res Int. 2023 Apr;30(17):50225-50233. doi: 10.1007/s11356-023-25785-0. Epub 2023 Feb 15.
Supervised field trail on dissipation of co-formulation with herbicides clodinafop-propargyl and oxyfluorfen in spring onion showed similar pattern of dissipation during two different seasons. Residues of clodinafop-propargyl reached ≤ limit of quantitation (LOQ, 0.05 mg kg) on 3rd day after application at both standard and double dose during both the seasons. Oxyfluorfen residues followed first-order kinetics in both the doses during first season with half-life of 0.81 to 3.14 days. The residues of clodinafop-propargyl were detected in soil at both the doses during first season. However, residues were ≤ LOQ (0.05 mg kg) during second season. The residues of oxyfluorfen were detected only in double dose during first season in soil. In all other cases and in onion bulb, residues were ≤ LOQ (0.05 mg kg) at the time of harvest. As the residues were either ≤ LOQ (0.05 mg kg) on 3rd day or have a half-life of 3.14 days, the co-formulation can be used safely, provided a pre harvest interval (PHI) of 3 days is followed. On the basis of maximum residue limits (MRLs) in other commodities and from the data of present study, a default MRL of 0.05 mg kg is proposed for both the pesticides.
在大葱上进行的炔草酯与乙氧氟草醚混配制剂消解的田间监督试验表明，在两个不同季节中，其消解模式相似。在两个季节中，无论是标准剂量还是双倍剂量，炔草酯的残留量在施药后第3天均降至≤定量限（LOQ，0.05 mg/kg）。在第一季，乙氧氟草醚在两种剂量下的残留均符合一级动力学，半衰期为0.81至3.14天。在第一季，两种剂量下的土壤中均检测到了炔草酯的残留。然而，在第二季，残留量≤定量限（0.05 mg/kg）。在第一季，仅在双倍剂量下的土壤中检测到了乙氧氟草醚的残留。在所有其他情况下以及在葱头中，收获时的残留量均≤定量限（0.05 mg/kg）。由于残留量在第3天要么≤定量限（0.05 mg/kg），要么半衰期为3.14天，因此只要遵循3天的安全间隔期（PHI），该混配制剂就可以安全使用。根据其他商品中的最大残留限量（MRLs）以及本研究的数据，建议这两种农药的默认最大残留限量均为0.05 mg/kg。
