Seasonal persistence of faecal indicator organisms in soil following dairy slurry application to land by surface broadcasting and shallow injection

A - Papers appearing in refereed journals

Hodgson, C. J., Oliver, D. M., Fish, R. D., Bulmer, N. M., Heathwaite, A. L., Winter, M. and Chadwick, D. R. 2016. Seasonal persistence of faecal indicator organisms in soil following dairy slurry application to land by surface broadcasting and shallow injection. Journal of Environmental Management. 183 (1), pp. 325-332.

AuthorsHodgson, C. J., Oliver, D. M., Fish, R. D., Bulmer, N. M., Heathwaite, A. L., Winter, M. and Chadwick, D. R.
Abstract

Dairy farming generates large volumes of liquid manure (slurry), which is ultimately recycled to agricultural land as a valuable source of plant nutrients. Different methods of slurry application to land exist; some spread the slurry to the sward surface whereas others deliver the slurry under the sward and into the soil, thus helping to reduce greenhouse gas (GHG) emissions from agriculture. The aim of this study was to investigate the impact of two slurry application methods (surface broadcast versus shallow injection) on the survival of faecal indicator organisms (FIOs) delivered via dairy slurry to replicated grassland plots across contrasting seasons. A significant increase in FIO persistence (measured by the half-life of E. coli and intestinal enterococci) was observed when slurry was applied to grassland via shallow injection, and FIO decay rates were significantly higher for FIOs applied to grassland in spring relative to summer and autumn. Significant differences in the behaviour of E. coli and intestinal enterococci over time were also observed, with E. coli half-lives influenced more strongly by season of application relative to the intestinal enterococci population. While shallow injection of slurry can reduce agricultural GHG emissions to air it can also prolong the persistence of FIOs in soil, potentially increasing the risk of their subsequent transfer to water. Awareness of (and evidence for) the potential for ‘pollution-swapping’ is critical in order to guard against unintended environmental impacts of agricultural management decisions.

KeywordsDiffuse microbial pollution; E. coli die-off; Manure management; Survival curves; Organic fertiliser; Pathogen risk
Year of Publication2016
JournalJournal of Environmental Management
Journal citation183 (1), pp. 325-332
Digital Object Identifier (DOI)doi:10.1016/j.jenvman.2016.08.047
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Natural Environment Research Council
Economic and Social Research Council
Funder project or codeSustainable and Holistic Food Chains for Recycling Livestock Waste to Land
Publisher's version
Copyright license
CC BY
Output statusPublished
Publication dates
Online04 Sep 2016
Publication process dates
Accepted16 Aug 2016
PublisherElsevier
Academic Press Ltd- Elsevier Science Ltd
ISSN0301-4797

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