Figure 6 - uploaded by Robert J. Blakemore
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Effects of earthworms on soils & plant growth (after 2 weeks); note that agrochemical trials use sterilized "dirt" to avoid such variability 'complications' rather than embracing soil biological benefits, as advocated by Blakemore( 2012b). 

Effects of earthworms on soils & plant growth (after 2 weeks); note that agrochemical trials use sterilized "dirt" to avoid such variability 'complications' rather than embracing soil biological benefits, as advocated by Blakemore( 2012b).