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Please use this identifier to cite or link to this item: http://hdl.handle.net/11019/516

Title: Effect of organic, conventional and mixed cultivation practices on soil microbial community structure and nematode abundance in a cultivated onion crop
Authors: Reilly, Kim
Cullen, Eileen
Lola-Luz, Theodora
Stone, Dorothy
Valverde, Juan
Gaffney, Michael
Brunton, Nigel
Grant, Jim
Griffiths, Bryan S
Keywords: Biolog Eco-plates
Microbial diversity
Community level physiological profile
Denaturing gradient gel electrophoresis
Organic agriculture
Issue Date: 7-Jun-2013
Publisher: Wiley
Citation: Reilly, K., Cullen, E., Lola-Luz, T., Stone, D., Valverde, J., Gaffney, M., Brunton, N., Grant, J. and Griffiths, B. S. (2013), Effect of organic, conventional and mixed cultivation practices on soil microbial community structure and nematode abundance in a cultivated onion crop. J. Sci. Food Agric., 93: 3700–3709. doi: 10.1002/jsfa.6206
Series/Report no.: Journal of the Science of Food and Agriculture;vol 93
Abstract: BACKGROUND: Responses of the soil microbial and nematode community to organic and conventional agricultural practices were studied using the Teagasc Kinsealy Systems Comparison trial as the experimental system. The trial is a long term field experiment which divides conventional and organic agriculture into component pest-control and soil treatment practices. We hypothesised that management practices would affect soil ecology and used community level physiological profiles (CLPP), microbial and nematode counts, and denaturing gradient gel electrophoresis (DGGE) to characterise soil microbial communities in plots used for onion (Allium cepa L.) cultivation. RESULTS: Microbial activity and culturable bacterial counts were significantly higher under fully organic management. Culturable fungi, actinomycete and nematode counts showed a consistent trend towards higher numbers under fully organic management but these data were not statistically significant. No differences were found in the fungal/bacterial ratio. DGGE banding patterns and sequencing of excised bands showed clear differences between treatments. Putative onion fungal pathogens were predominantly sequenced under conventional soil treatment practices whilst putative soil suppressive bacterial species were predominantly sequenced from the organic pest-control treatment plots. CONCLUSION: Organic management increased microbial activity and diversity. Sequence data was indicative of differences in functional groups and warrants further investigation.
Description: pre-print, non-peer-reviewed
The Irish Department of Agriculture, Fisheries and Food (FIRM 06/NITARFC6) is gratefully acknowledged for financial support. TLL thanks IRCSET and OGT for financial support.
URI: http://hdl.handle.net/11019/516
ISSN: 0022-5142
Appears in Collections:Environment, Soils & Land Use

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