The drilosphere is the part of the soil influenced by earthworm secretions and castings^[1]. Specifically, it is the fraction of soil which has gone through the digestive tract of earthworms^[2]; or the lining of an earthworm burrow^[3]. Loess field in Germany Soil horizons are formed by combined biological, chemical and physical alterations. ... Families   Acanthodriladae   Ailoscolecidae   Alluroididae   Almidae   Biwadrilidae   Eudrilidae   Exxidae   Glossoscolecidae   Lumbricidae   Lutodrilidae   Megascolecidae   Microchaetidae   Ocnerodrilidae   Octochaetidae   Sparganophilidae Earthworm is the common name for the larger members of the Oligochaeta (which is either a class or subclass depending on the author) in the phylum Annelida. ...

The average thickness of the drilosphere (lining of an earthworm burrow) is 2mm^[4]. About 40 per cent of the aerobic (and 13 per cent of anaerobic) nitrogen-fixing bacteria and 16 per cent of the denitrifiers are contained within the drilosphere^[5]. An aerobic organism or aerobe is an organism that has an oxygen based metabolism. ... An anaerobic organism or anaerobe is any organism that does not require oxygen for growth. ... Diazotrophs are microorganisms that fix atmospheric nitrogen gas in to a more usable form such as ammonia. ...

The term was coined by M. B. Bouché.

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