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Liquid Ion Exchanger Microelectrodes Used to Study Soil Solute Concentrations near Plant Roots
Author(s) -
Hamza M.,
Aylmore L. A. G.
Publication year - 1991
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1991.03615995005500040009x
Subject(s) - raphanus , microelectrode , transpiration , chemistry , transpiration stream , diffusion , lupinus angustifolius , concentration gradient , botany , environmental chemistry , analytical chemistry (journal) , electrode , biology , physics , thermodynamics , biochemistry , photosynthesis
A technique for using Na + liquid ion exchanger (Na + ‐LIX) microelectrodes to accurately measure, repetitively, and in a nondestructive fashion, Na + concentrations in the soil solution at single points is described. The method has been used to examine solute (NaCl) accumulation in proximity to single roots of lupine ( Lupinus angustifolius L.) and radish ( Raphanus sativus L.) plants subjected to two levels of transpirational demand and five soil solute concentrations. The results obtained indicate that, at soil water contents corresponding to matric water potentials >−140 kPa, back diffusion of solute significantly counteracts the tendency for solute accumulation at root surfaces during transpiration.