Significant differences in earthworm populations and soil properties were found in three sections of a farm at Haughley in Suffolk that, since 1939, had either an organic, a mixed conventional, or a stockless intensive arable regime. Compared with the mean earthworm population of a 1,000 year old permanent pasture of 424.0 m−2; an organic field had 178.6 m−2; a mixed field 97.5 m−2; and a stockless field 100.0 m−2. Species recorded were:Allolobophora chlorotica, accounting for most of the increase in the organic section;Aporrectodea caliginosa, dominant in the stockless section;Aporrectodea icterica; Ap, longa; Ap. nocturna; Ap. rosea; andLumbricus terrestris.