Long-term Impact of sewage sludge application on rhizobium leguminosarum biovar trifolii: an evaluation using meta-analysis

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dc.contributor.authorCharlton, Alex
dc.contributor.authorSakrabani, Ruben
dc.contributor.authorMcGrath, Steve P.
dc.contributor.authorColin D. Campbell, Colin D.
dc.date.accessioned2016-08-18T15:35:20Z
dc.date.available2016-08-18T15:35:20Z
dc.date.issued2016-07-07
dc.description.abstractThe Long-Term Sludge Experiment (LTSE) began in 1994 at nine UK field sites as part of continuing research into the effects of sludge-borne heavy metals on soil fertility. The long-term effects of Zn, Cu, and Cd on the most probable numbers of cells (MPN) of Rhizobium leguminosarum biovar trifolii were monitored for 8 yr in sludge-amended soils. To assess the statutory limits set by the UK Sludge (Use in Agriculture) Regulations, the experimental data were reviewed using statistical methods of meta-analysis. Previous LTSE studies have focused predominantly on statistical significance rather than effect size, whereas meta-analysis focuses on the magnitude and direction of an effect, i.e., the practical significance rather than its statistical significance. Results showed Zn to be the most toxic element causing an overall significant decrease in Rhizobium MPN of āˆ’26.6% during the LTSE. The effect of Cu showed no significant effect on Rhizobium MPN at concentrations below the UK limits, although a āˆ’5% decrease in Rhizobium MPN was observed in soils where total Cu ranged from 100 to <135 mg kgāˆ’1. Overall, there was nothing to indicate that Cd had a significant effect on Rhizobium MPN below the current UK statutory limit. In summary, the UK statutory limit for Zn appears to be insufficient for protecting Rhizobium from Zn toxicity effects.en_UK
dc.identifier.citationAlex Charlton, Ruben Sakrabani, Steve P. McGrath and Colin D. Campbell. Long-term Impact of Sewage Sludge Application on Rhizobium leguminosarum biovar trifolii: An Evaluation Using Meta-Analysis. Journal of Environmental Quality, 2016, Vol. 45 No. 5, pp1572-1587en_UK
dc.identifier.issn0047-2425
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/10347
dc.identifier.urihttp://dx.doi.org/10.2134/jeq2015.12.0590
dc.language.isoenen_UK
dc.publisherAmerican Society of Agronomy; Crop Science Society of America; Soil Science Society of Americaen_UK
dc.rightsAttribution 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.titleLong-term Impact of sewage sludge application on rhizobium leguminosarum biovar trifolii: an evaluation using meta-analysisen_UK
dc.typeArticleen_UK

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