Identification of Residues of Sulfosulfuron and its Metabolites in Subsoil-dissipation Kinetics and Factors Influencing the Stability and Degradation of Residues from Topsoil to Subsoil Under Predominant Cropping Conditions |
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Authors: | Ramesh Atmakuru Thirugnanam Perumal Elumalai Sathiyanarayanan Sivanandam |
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Institution: | (1) Department of Analytical Chemistry, International Institute of Bio-technology and Toxicology (IIBAT), Padappai, Chennai 601 301, Tamil Nadu, India |
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Abstract: | Long term stability of sulfosulfuron was investigated in subsoil under the natural wheat cropping conditions. Experiments
were conducted by applying a commercial formulation of sulfosulfuron on soil at 50 g/ha and 100 g/ha. To understand the factors
influencing the persistence of residues two different experiments were conducted. In one experiment wheat crop was cultivated
once at the beginning of the two years study period and subsequently the plots were kept undisturbed for the remaining period.
In another experiment cultivation of subsequent crops were continued during the study period. In both the cases sulfosulfuron
was applied only once at the beginning of the study. Representative soil samples were collected from the depths viz., 0–5,
15, 30, 45, 60 and 90 cm on different pre determined sampling occasions 50, 100, 200, 300, 400, 500 and 600 days after the
application of the herbicide. The collected soil samples were analyzed for the residues of sulfosulfuron. Under the influence
of continuous cropping conditions residues of sulfosulfuron were found to be relatively low when compared with the soil samples
collected from the agriculture plots maintained without any cultivation. The residues detected are in the range 0.001 to 0.017 μg/g.
Samples collected from the depth, at 30 to 45 cm showed higher residual concentrations. Soil samples were also showed the
presence of break down products. The data has been confirmed by LC–MS/MS. The relation between residue content of sulfosulfuron
and the factors contributing the stability of herbicide concentration were also studied. |
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Keywords: | Persistence Residues Subsoil Sulfosulfuron |
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