Affiliations: College of Environmental and Resource Sciences,
Department of Resources Science, Zhejiang University, Hangzhou 310029,
China | College of Environmental and Resource Sciences,
Department of Environmental Science, Zhejiang University,Hangzhou 310029,
China
Abstract: The impact of triazophos, bensulfuron-methyl, chlobenthiazone on
soil biochemical characteristics in a paddy soil under controlled moisture
(flooded soil) and temperature (25°C) condition was studied. The electron
transport system (ETS)/dehydrogenase activity displayed a negative correlation
with triazophos, bensulfuron-methyl, chlobenthiazone concentrations, and the
activity decreased as the concentration of the pesticides increased. The higher
doses, 5 and 10 field rates, of triazophos, bensulfuron-methyl, chlobenthiazone
significantly inhibited ETS activity, while lower rates failed to produce any
significant reducing effect against the control. The relative toxicity of
triazophos, bensulfuron-methyl, chlobenthiazone in decreasing the ETS activity
was in the order: triazophos > chlobenthiazone > bensulfuron-methyl,
irrespective of the rates of application. Triazophos, bensulfuron-methyl,
chlobenthiazone caused an improvement in the soil phenol content and it
increased with increasing concentration of triazophos, bensulfuron-methyl,
chlobenthiazone. Triazophos, bensulfuron-methyl, chlobenthiazone incorporation
did not produce any significant change in soil protein content. The response of
biomass phospholipid content was nearly similar to ETS activity. The
phospholipid content was decreased with the addition of triazophos,
bensulfuron-methyl, chlobenthiazone in the order of triazophos >
chlobenthiazone > bensulfuron-methyl; and the toxicity of applied amount was
in the order: 10 FR (field rate) > 5 FR > 1.0 FR > 0.5 FR >
control.
