The rhizosphere: some conventions Root Rhizoplane Inner rhizosphere Outer rhizosphere 0-10pm 10-500pm 500-5000pm But defined phases may not be helpful because of Padients(no sharp boundaries)The rhizosphere: some conventions Outer rhizosphere 500-5000 µm Inner rhizosphere 10-500 µm Rhizoplane 0-10 µm Root But defined ‘phases’ may not be helpful because of gradients (no sharp boundaries)