In three of four trials, total earthworm density did not differsignificantly between tillage types for a given trial (Fig. 1). Con-versely, in trial A, 1.77 times more individuals were retrieved indirect seeding plots than in superficially tilled plots and 1.97-foldthan in plowed plots. Three species displayed density differences.In trial C, A. giardi was 6 times as numerous in superficially tilledplots as in tilled plots. In trial B, 18 times as many individual of A.chlorotica were collected in plowed plots as in direct seeding plots.Regarding L. terrestris, their densities were found to be promoted inST and DS plots when compared to P plots within trials A, B and D.The ranges of increase in density were 2–3× and 6–15× in ST andDS respectively. High values of L. terrestris densities in DS plots of Asite corresponded to juvenile recruitment. Within the four sites, themean species richness was not influenced by tillage type (Table 5).Conversely, the mean species richness highly varied between trials,from 2.8 to 7.1 for trials C and A respectively.