Vol. 10 No. 2
Residual fate and persistence behaviour of a mixed herbicide formulation (pyroxsulam 4.5% OD + sulfosulfuron 75% WDG) in wheat plant and field soil
Author(s): B. Ghosh, A. Bhattacharyya, S. Mukherjee, S. Das and A Bhattacharyya
Abstract: To find out the persistence behavior of a mixed herbicide formulation Pyroxsulam 4.5% oil dispersion (OD) and Sulfosulfuron 75% water dispersible granules (WDG), a supervised field study was conducted in B.C.K.V. experimental farm, Mohanpur, West Bengal during 2012-2013 and 2013-2014. The mixed herbicide formulation was applied @ 18 g and 36 g a.i. ha-1 along with untreated control and was analyzed by LC-MS/MS in MRM mode. The method includes extraction with acetonitrile for Pyroxsulam and ethyl acetate for Sulfosulfuron separately followed by clean up using dispersive solid phase extraction (d-SPE) with PSA ,GCB (only for plant) and activated MgSO4. The ethyl acetate extract was evaporated under a nitrogen evaporator and reconstituted with acetonitrile. The average recovery percentage of Pyroxsulam and Sulfosulfuron was 87.67% and 85.07% for wheat plant, 88.87% and 87.40% for wheat straw, 85.67% and 90.80% for wheat grain and 86.27% and 86.00% for field soil respectively. Following 1st order kinetics, the half-life of Pyroxsulam and Sulfosulfuron was found in the range of 1.51-1.67 days and 1.68-2.95 on wheat plant and 1.95-2.84 days and 2.89-3.58 on field soil irrespective of dose and season. No residue of Pyroxsulam and Sulfosulfuron was detected in harvest samples of wheat straw, grain and field soil...
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