Competitive biodegradation of dichlobenil and atrazine coexisting in soil amended with a char and citrate |
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| Authors: | Yuping Qiu Hui Pang Zunlong Zhou Ping Zhang Yucheng Feng G Daniel Sheng |
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| Institution: | aCollege of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, China;bDepartment of Civil Engineering, University of Minnesota, Minneapolis, MN 55455, USA;cDepartment of Agronomy and Soils, Auburn University, Auburn, AL 36849, USA |
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| 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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| Keywords: | Biodegradation Char nutrients Dichlobenil Atrazine P |
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