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EFFECT OF DIFFERENT EXTERNAL K+/Na+ AND Ca2+/Na+ RATIOS ON GROWTH, IONIC COMPOSITION AND SELECTIVITY OF RICE LINES VARYING IN SALT TOLERANCE

Two separate experiments in solution culture were conducted simultaneously under saline conditions with varying external K:Na ratios. Shoot and root yield, their composition and selectivity of Kover Na under all set of conditions were calculated for NIAB-6 (salt tolerant) and IR 1561 (salt sensitive). Salinity decreased shoot and root yield drastically but different ratios of K:Na and Ca:Na did not affect these yields in both cultivars. Concentration of K and Ca in tissues increased with their increasing levels in the external solutions. Salinity though reduced K:Na level in shoot and root yet salt tolerant line (NIAB-6) maintained better selectivity (S K+' Na +; under saline conditions. The role of Ca in the improvement of K selectivity (8K+. Na +) under saline environment has been discussed.