Suarez, D. L. and Grieve, C. M. 1988. Predicting cation ratios in corn from saline solution composition.—J. exp. Bot. 39: 605-612. The response of Zea mays (L.) cv. Pioneer 3906 to nutrient cultures that varied in Na/Ca ratios was studied at 5 different salinity levels; 0, —01, -0-2, -0-3 and -0-4 MPa. Principles of ion exchange theory were used to relate the cation composition (Ca, Mg and Na) in the shoots to activity ratios in the root media. The data are expressed using the Gapon convention where the selectivity coefficient is related to the equivalent fraction of the exchange ions. Plots of the cation ratios of Ca/Na, Ca/Mg and Mg/Na can be represented by a single line regardless of salinity level. This information supports the concept derived from physiological studies that the uptake of Ca, Mg and Na by salt-stressed plants is passive. The data suggest that the ratios of these cations in corn shoots can be predicted for various salinities from solution composition of the root media and shoot ion concentrations at a single salinity level.
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