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A field study with wheat crop was undertaken to examine the efficacy of two soil amendments, cereal straw and fresh cow dung slurry, in reducing leaching of sulfosulfuron to groundwater and its residue load in soil. The herbicide was extracted by the QuEChER’S method and quantified through high performance liquid chromatography. The amendments had no effect on the general properties of groundwater. Both cereal straw and fresh cow dung reduced leaching of sulfosulfuron into groundwater but cereal straw was more effective, probably because its addition decreases soil pH, thereby causing faster hydrolysis of the herbicide. At harvest time, residues of the herbicide in grains, straw and soil were below recommended maximum residue limits (0.1 mg kg-1) with both amendments. Thus, both the amendments can be recommended for wheat cropping systems to control sulfosulfuron leaching to groundwater. Keywords: Groundwater, Soil amendments, Wheat crop, Sulfosulfuron, Leaching |
