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  • Title: Competitive biodegradation of dichlobenil and atrazine coexisting in soil amended with a char and citrate.
    Author: Qiu Y, Pang H, Zhou Z, Zhang P, Feng Y, Sheng GD.
    Journal: Environ Pollut; 2009 Nov; 157(11):2964-9. PubMed ID: 19564067.
    Abstract:
    The role of char nutrients in the biodegradation of coexisting dichlobenil and atrazine in a soil by their respective bacterial degraders, DDN and ADP, was evaluated. Under growing conditions, their degradation in soil extract was slow with <40% and <20% degraded within 64 h, respectively. The degradation in extracts and slurries of char-amended solids increased with increasing char content, due to nutritional stimulation on microbial activities. By supplementing soil extract with various major nutrients, the measured degradation demonstrated that P was the exclusive limiting nutrient. The reduction in the degradation of coexisting dichlobenil and atrazine resulted apparently from the competitive utilization of P by DDN and ADP. With a shorter lag phase, ADP commenced growing earlier than DDN with the advantage of utilizing P first in insufficient supply. This resulted in an inhibition on the growth of DDN and thus suppression on dichlobenil degradation.
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