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Determination of cation exchange capacity of ryegrass roots by summing exchangeable cations


Cations were desorbed from root exchange sites of ryegrass (Lolium multiflorum Lam. cvs. Gulf, Marshall, Urbana, and Wilo) using BaCl2, BaCl2-triethanolamine, NH4OAc, and KCl. Results were analysed using multivariate analysis of variance. Ba2+-containing desorbents displaced more Ca2+ while monovalent desorbents displaced more exchangeable monovalent cations. The sum of adsorbed cations was significantly correlated with root exchange capacity (CEC) as determined by the H+ titration procedure, although slightly larger values were obtained with all desorbents. Lower CEC values were obtained for ryegrass cultivars less sensitive to Al.

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Approved for publication by the Director of the Louisiana Agricultural Experiment Station as manuscript No. 88-09-2778.

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Rengel, Z., Robinson, D.L. Determination of cation exchange capacity of ryegrass roots by summing exchangeable cations. Plant Soil 116, 217–222 (1989).

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Key words

  • cation exchange capacity
  • desorption
  • Donnan free space
  • exchangeable cations
  • Lolium multiflorum Lam
  • root