The presence of earthworms led to a decrease of the soil OC
content in the treatments with organic amendments but no
difference was observed with mineral fertilization. Earthworm
activity also led to a decrease of the nitrogen content in soils
amended with compost, whereas the differences were not significant
for the vermicompost and mineral fertilization treatments. No
difference in OC/N ratio was noticed between the different treatments,
except for the mineral treatments which had a lower OC/N
ratio than the organic fertilization treatments, with and without
earthworms.