• Ajmeri Sultana Rahman
• Abhilash Bhattacharjee

Thiamethoxam is widely use in north east India and Assam. However, effect on soil microorganisms isn't plainly comprehended. To understand the degree of the pesticide's effect on soil microbial activity, study was performed. Microbial Colony Forming units (CFU/mL), Nitrate reductase activity and dehydrogenase activity were used to estimate the microbial dynamics in soil. Soil were treated with 0.20%, 0.40% and 0.80% of Thiamethoxam and observations were recorded on 0th, 3rd, 7th, 15th and 21st days after treatment. Treated soil demonstrated a noteworthy change in number of colony per gram of soil minimum being in 0.80%. Nitrate reductase activity also showed significant decrease, minimum observed in 0.80% on the 21st day followed by 0.40% on the 15th day. Dehydrogenase activity however increased in 0.20%, 0.40% and 0.80%. Results indicated a negative effect of Thiamethoxam on soil microbial colonies and their enzyme activity and hence negative impact on soil health.

Insecticide, Thiamethoxam, Microbial Colony forming units, Nitrate reductase activity, Dehydrogenase activity

"Thiamethoxam’s Impact on Soil Microbial Population and Metabolic Enzyme Activity", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.5, Issue 8, page no.720-729, August-2018, Available :http://www.jetir.org/papers/JETIR1808863.pdf

"Thiamethoxam’s Impact on Soil Microbial Population and Metabolic Enzyme Activity", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.5, Issue 8, page no. pp720-729, August-2018, Available at : http://www.jetir.org/papers/JETIR1808863.pdf