Rhizoplane - The rhizoplane is the site of exudates. The rhizoplane is the boundary where soil elements in water are absorbed into the tree. Under an electron microscope, the rhizoplane appears as a jelly where microorganisms and tree cells mix, making it impossible to tell which side is tree and which is soil.
See "A Touch of Chemistry " and
"Troubles in the Rhizosphere" for starters.
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