Effect of chlorpyrifos on microbial respiration and enzyme activities in soil

Abstract

To investigate the effects of different concentrations of chlorpyrifos on soil ecological environment and on soil respiration, catalase, urease, and levansucrase activity, studied by laboratory simulation methods. The results showed that: different concentrations of chlorpyrifos on soil respiration has a significant activation effect only at the first day, and a positive correlation with the concentration; different concentrations of chlorpyrifos on soil catalase activity is not significant; the inhibition of soil urease is not significant at the concentration of 10mg/kg, while the inhibition is significant at 100mg/kg and 500mg/kg; no significant effects on the soil levansucrase activity when the concentration is 10mg/kg in the first 10 days, but significant in the later days and the situation is contrary to the above when the chlorpyrifos concentration is 100mg/kg and 500mg/kg.

Impacts of long-term application of buctril super (bromoxynil) herbicide on microbial population, enzymes activity, nitrate nitrogen, Olsen-P and total organic carbon in soil

“…to application of chlorothalonil herbicide. Similarly, Niu et al (2011) reported an inhibition in urease activity due to high dose of chlorpyriphos. All sites showed considerable decreases in dehydrogenase activity in soil X as compared to soil Y.…”

“…Soil phosphatases promote mineralization of organic phosphorus and enhance its availability to soil microorganisms and plants (Schneider et al 2001). Niu et al (2011) observed a considerable decline in urease activity due to high concentration of chlorpyriphos (100 and 500 mg kg −1 ) as compared to low concentration (10 mg kg -1 ). Pampulha and Oliveira (2006) found 74% inhibition in dehydrogenase activity by 1.0 mg kg -1 dose of the combined mixture of bromoxynil + prosulfuron as compared to control.…”