A survey of organic and conventional potato fields shows that species evenness is greater under organic management. Replicating these levels of evenness in a field trial shows that the evenness of natural enemies found in organic fields promotes pest control and increases crop biomass. This is independent of the identity of the dominant enemy species, so is a result of evenness itself.
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Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/organic-agriculture-promotes-evenness-and-natural-pest-control
[2] http://admin.indiaenvironmentportal.org.in/category/author/david-w-crowder
[3] http://admin.indiaenvironmentportal.org.in/category/author/tobin-d-northfield
[4] http://admin.indiaenvironmentportal.org.in/category/author/michael-r-strand-et-al
[5] http://admin.indiaenvironmentportal.org.in/category/journal/nature
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ecosystem-services
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/organic-farming
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pest-control
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/biological-pc
