Effect of Different Substrate K+ / Na+ Ratios on Yield and Potassium Sodium Selectivity of Selected Wheat Cultivars
The results of this study indicate, that salt tolerance of wheat cultivars under consideration is related to high potassium sodium selectivity (S K+, Na+) and lower concentration of K++Na+ in the plant tissue. It is found that higher the S K+, Na+ the higher the absolute dry matter yield and higher the salt tolerance of cultivars. Cultivars Bao-119, FSD-85 and c.v., 86-6 showed tolerant, medium and sensitive behavior respectively under saline condition. It is also evident that a decrease K+/Na+ ratio in media resulted in increased uptake of Na+ and decreased that of K+. At the same time SK+Na+ increased while total concentration of K++Na+ decreased. Further more the lower K+/Na+ ratio of 1/50 decreased the uptake of Na+ and increased the K+. It can therefore, be deducted that S K+, Na+ should be considered seriously when breeding salt tolerant wheat cultivars to be grown economically in saline soils. Much more research is still needed in this area.
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