Author(s):

Shivnam Rana and VK Gupta

Abstract: Thiamethoxam is a second-generation neonicotinoid poses risk to non-target organism and have potential of leaching to contaminate underground water. Biodegradtion of thiamethoxam by microbial species is a biological way to reduce the contaminant. In the present paper, persistence of thiamethoxam in clay loam soil was studied for 56 days in laboratory conditions. <em>Bacillus</em> <em>aerophilus</em> strain IMBL 4.1 bacterium isolated from field soil and used to spike the soil sample containing different concentration (25, 50 and 100 mg kg⁻¹) of thiamethoxam. <em>Bacillus</em> <em>aerophilus</em> strain IMBL 4.1 resulted in the active biodegradation of thiamethoxam. Half-life (<em>t</em>_1/2) and the correlation coefficient (R²) were studied and none of value was found more than 0.99 (R² values) so, total thiamethoxam residues did not follow the first-order kinetics neither in control nor in amended samples. From the study, it was demonstrated that <em>B. aerophilus</em> has potential for biodegradation of thiamethoxam in clay loam soils.

Pages: 294-298  |  1535 Views  533 Downloads

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