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Plant Responses to Sulfate and Chloride Salinity: Growth and Ionic Relations
Author(s) -
Curtin D.,
Steppuhn H.,
Selles F.
Publication year - 1993
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/sssaj1993.03615995005700050024x
Subject(s) - salinity , hordeum vulgare , soil salinity , chemistry , halotolerance , salt (chemistry) , agronomy , sodium , solubility , sulfate , poaceae , biology , ecology , organic chemistry
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/CaCl 2 ) salinization procedures, are appropriate to the prairies, where SO 4 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 SO 4 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 SO 4 system. However, barley salinized with SO 4 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/CaCl 2 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/CaCl 2 salinization probably provide an acceptable measure of the tolerance of most crops to SO 4 salinity.