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Effect of fly ash amendment on metolachlor and atrazine degradation and microbial activity in two soils

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Abstract

The study reports the effect of Inderprastha (IP) and Badarpur (BP) fly ashes on degradation of metolachlor and atrazine in Inceptisol and Alfisol soils. Metolachlor dissipated at faster rate in Alfisol (t1/2 8.2–8.6 days) than in Inceptisol (t1/2 13.2–14.3 days). The fly ashes enhanced the persistence of metolachlor in both the soils; however, the extent of effect was more in Inceptisol (t1/2 16.6–33.8 days) than Alfisol (t1/2 8.4–12 days) and effect increased with fly ash dose. 2-Ethyl-6-methylacetanilide was detected as the only metabolite of metolachlor. Atrazine was more persistent in flooded soils (t1/2 10.8–20.3 days) than nonflooded soils (t1/2 3.7–12.6 days) and fly ash increased its persistence, but effect was more pronounced in the flooded Inceptisol (t1/2 23.7–31 days) and nonflooded Alfisol (t1/2 6.3–10.1 days). Increased herbicide sorption in the fly ash-amended soils might have contributed to the increased pesticide persistence. The IP fly ash inhibited microbial biomass carbon at 5 % amendment levels in both the soils, while BP fly ash slightly increased microbial biomass carbon (MBC) content. Dehydrogenase activity was inhibited by both fly ashes in both the soils with maximum inhibition observed in the IP fly ash-amended Alfisol. No significant effect of fly ash amendment was observed on the fluorescein diacetate activity.

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Acknowledgment

Rakesh Kumar Ghosh was supported by the INSPIRE fellowship from the Department of Science and Technology (DST), Government of India, New Delhi, India.

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Correspondence to Neera Singh.

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The authors declare that they have no conflict of interest. Consent to publish the work from co-author and the responsible authority of institution, where work was carried out, has been obtained. Research does not involve humans or animals.

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Ghosh, R.K., Singh, N. & Singh, S.B. Effect of fly ash amendment on metolachlor and atrazine degradation and microbial activity in two soils. Environ Monit Assess 188, 482 (2016). https://doi.org/10.1007/s10661-016-5486-x

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