# the soil zone immediately surrounding a plant root system.
pewagbiotech.org/resources/glossary/

# The soil region in the immediate vicinity of growing plant roots.
www.fao.org/docrep/003/X3910E/X3910E21.htm

# The soil zone immediately surrounding plant roots, which is modified by the increased number of microorganisms (eg Rhizobia) that live there, in association with plant roots.
www.jic.bbsrc.ac.uk/exhibitions/bio-future/glossary.htm

# An environment regarded, variously, as (a) that region of the soil modified as a result of the uptake and deposition of substances by a growing root, (b) the root itself, together with that volume of soil which it influences, (c) the root surface together with that region of the surrounding soil in which the microbial population is affected by the presence of a root. (16)
ppathw3.cals.cornell.edu/glossary/Defs_R.htm

# The area around plant roots that is the site of many key interactions between microbes and the plant. It is also the site where nutrients are transformed for take-up by the plant.
pbi-ibp.nrc-cnrc.gc.ca/en/media/glossary.htm

# The area of soil in the vicinity of the plant roots.
www.ucc.ie/impact/glossf.html

# A zone of biological activity around roots.
nov55.com/mr/glos.html