A comparison of effect of dimethoate and imidacloprid on soil respiration (carbon dioxide evolution from soil)
Journal Title: Journal of Biodiversity and Environmental Sciences (JBES) - Year 2013, Vol 3, Issue 6
Abstract
Several microorganisms, meso and macroorganisms have been reported for maintaining soil fertility. They are responsible for breakdown of organic matter and release of carbon dioxide, which is a measure of soil respiration, during their metabolic activities. But due to excessive use of agrochemicals, the populations of these beneficial microorganisms are declining which may decrease the fertility status of soil. Several studies were conducted on the toxic impact of some pesticides on soil respiration and reported that pesticides decreases or increases as well as have no effect on soil respiration. But no detailed study was conducted to find out the impact of imidacloprid and dimethoate, the commonly used pesticides in India, on soil respiration i.e. CO2 evolution from soil under laboratory conditions. The experiment found that the CO2 evolution drastically came down to 44.77% and 27.27% within 15 days of the application of dimethoate and imidacloprid respectively and gradually it recovered after 90 days. Two-way ANOVA indicates significant difference in soil respiration rate with respect to both doses of pesticides and days (F1=15.94, F2=10.71, p<0.05). One-way ANOVA shows significant difference between control and experimental sets up to 75 days (F4.70, p<0.05). LSD test reveals that significant difference among control, imidacloprid and dimethoate treated soils was only up to 30 days (p<0.05). This test further reveals that there was significant difference between control and dimethoate treated soil up to 75 days indicating that dimethoate is more toxic as compared to imidacloprid.
Authors and Affiliations
Anindita Bhattacharya, Sanjat Kumar Sahu
Keywords
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