Plant uptake of aldicarb from contaminated soil and its enhanced degradation in the rhizosphere.
Experiments were conducted to investigate the degradation of aldicarb, an oxime carbamate insecticide, in sterile, non-sterile and plant-grown soils, and the capability of different plant species to accumulate the pesticide. The degradation of aldicarb in soil followed first-order kinetics. Half lives (t1/2) of aldicarb in sterile and non-sterile soil were 12.0 and 2.7 days, respectively, which indicated that microorganisms played an important part in the degradation of aldicarb in soil. Aldicarb disappeared more quickly (p< or =0.05) in the soil with the presence of plants, and t1/2 of the pesticide were 1.6, 1.4 and 1.7 days in the soil grown with corn, mung bean and cowpea, respectively. Comparison of plant-promoted degradation and plant uptake showed that the enhanced removal of aldicarb in plant-grown soil was mainly due to plant-promoted degradation in the rhizosphere.
College of Environmental Science and Engineering, Nankai University, 94 Weijin Road, Tianjin 300071, China. sunhongwen@eyou.com
Hongwen
H
Sun
Jian
J
Xu
Songhua
S
Yang
Guangliang
G
Liu
Shugui
S
Dai
D000448:Aldicarb / Q000378:metabolism*; D001673:Biodegradation, Environmental; D007887:Fabaceae / Q000378:metabolism* / Q000382:microbiology; D007700:Kinetics; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D003313:Zea mays / Q000378:metabolism* / Q000382:microbiology
D012989:Soil Pollutants; D000448:Aldicarb