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Plant Responses to Sulfate and Chloride Salinity: Growth and Ionic Relations

Research Station, Research Branch, Agriculture Canada, P.O. Box 1030, Swift Current, SK, Canada S9H 3X2

*Corresponding author.

ABSTRACT

Growing salt-tolerant crops is one of the more cost-effective strategies for coping with soil salinity, which is a significant factor affecting crop production and agricultural sustainability on the Canadian prairies. This study was carried out to determine if salt tolerance data, generated by traditional Cl (NaCl/CaCl₂) salinization procedures, are appropriate to the prairies, where SO₄ salinity predominates. Barley (Hordeum vulgare L., cv. Bonanza) and kochia [Kochia scoparia (L.) Schrad.] seedlings were grown in sand culture and salinized with either Cl or SO₄ salts. The latter system was designed to mimic the natural salinity of prairie soils. The results showed that plant responses to salinity depend on the kind of salts (sulfates or chlorides) contributing to salinity as well as on the total electrolyte concentration. Growth was significantly better (by an average of 17%) on the SO₄ system. However, barley salinized with SO₄ salts developed severe Ca deficiency at high salt concentrations (electrical conductivity [EC] 17.5–27.5 dS m^–1) because of low solubility of Ca. Kochia, which is more efficient than barley in absorbing Ca, was not limited by Ca. Barley and kochia tended to have higher selectivity for nutrient cations (Ca, Mg, and K) over Na when the plants were grown on the Cl salt system. This may be an indication of a beneficial effect of the high Ca supply in the NaCl/CaCl₂ salt system on membrane selectivity. Our results show that there are many possible interactions between salt concentration, salt type, and plant nutrition. The significance of these interactions for salt tolerance testing may vary from crop to crop and may depend on factors such as the nutrient concentration in the growing medium. From a practical standpoint, however, response functions generated by NaCl/CaCl₂ salinization probably provide an acceptable measure of the tolerance of most crops to SO₄ salinity.

Received for publication December 3, 1992.

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