Exchange and Absorption of Cations by Excised Roots1
Barley (Hordeum Vulgare) corn (zea Mays L.), and soybeans (Glycline max) were given pretreatments which were designed to alter the root cation-exchange capacity. The amounts of Ca and K absorbed by the excised roots after a 1 hour uptake period in 10-3N chloride solution were displaced by a series of successive rinses ranging in pH from 2 to 12. There was a significant linear correlation between uptake of both Ca and K and the exchangeable Ca and K in several of the rinses, particularly with the exchangeable ions which were not removed by the first acid rinse but which were removed with subsequent rinses. Multiple correlation coefficients for these relationships ranged from 0.79 to 0.96. The method of fractionating the adsorbed ions showed promise for studying exchange properties of plant roots.
Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
Copyright © . Soil Science Society of America.