Abstract
Effects of municipal biosolids on microbial N2-fixation in agricultural soil were assessed in a 3-month laboratory study which included analysis of metals, pharmaceuticals, and personal care products. Reference agricultural soil was amended with organic manure or municipal biosolids from a southern Ontario wastewater plant, with a biosolids-only treatment included to evaluate metabolic activity in this inoculum. Microbial N2-fixation in reference and manure-amended soils were similar (p = 0.144) over 3 months and lower than in biosolids-amended soil (p = 0.001); however, differences among soil treatments decreased over time, with no significant difference at test termination. In general, one-time application of biosolids caused short-term stimulation of N2-fixing activity with a return to reference conditions within 3 months. Although no residual effects were detected, biosolids introduced elevated levels of metals, pharmaceuticals, personal care products (particularly analgesics), and viable bacteria; long-term effects caused by repeat applications (as commonly practiced) requires further investigation.
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Acknowledgments
The authors thank Joseph Bautista and Dennis Walmsley for assistance during the experiment. Research was funded by an Ontario Graduate Scholarship in Science and Technology (OGSST), an Ontario Graduate Scholarship (OGS), a Ryerson Graduate Award, a Golder Associates Ltd. Continued Learning Award, an NSERC Operating Grant to Dr. Lynda McCarthy, and the Ryerson Department of Chemistry and Biology. Chemical analysis by AGAT Laboratories was funded by Golder Associates Ltd.
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Holt, L.M., Laursen, A.E., McCarthy, L.H. et al. Effects of land application of municipal biosolids on nitrogen-fixing bacteria in agricultural soil. Biol Fertil Soils 46, 407–413 (2010). https://doi.org/10.1007/s00374-009-0431-6
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DOI: https://doi.org/10.1007/s00374-009-0431-6