We evaluated the short-term effects on earthworms of sidedressing solid dairy cattle manure on corn. The manure rates were 40, 46 and 53 t/ha applied in 1991, and a control (no manure). From 1988 to 1990, the manure plots received solid dairy cattle manure sidedressed at an annual rate of 40 to 50 t/ha, the equivalent of 100 kg N/ha, while the control received a standard mineral fertilization. The experiment took place at the MAPAQ experimental station in St.-Lambert, Quebec, Canada. Sampling occurred in autumn 1991 and spring 1992.

Sidedressing solid dairy cattle manure in spring increased earthworm populations compared with the control in fall 1991, but no significant population differences were observed among the three different manure treatments, which were then pooled for further statistical analysis. In spring 1992, the populations declined, at which time the manure treatment and the control did not differ significantly in abundance, but total earthworm biomass and Lumbricus biomass were significantly higher in the manure treatment. Cocoon production showed significant differences between treatments, which provides evidence for the potential effect of manure sidedressing on earthworm population dynamics. Although the genus Aporrectodea (endogeic) was dominant among the treatments, sidedressing of solid dairy cattle manure also stimulated Lumbricus populations, especially juveniles and adult L terrestris (epianecic).