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Effect of Soil Salinity and Sodicity on Seedling Growth and Mineral Composition of Pongamia pinnata
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Performance of Pongamia pinnata was evaluated under pot culture conditions at artificially created varying salinity (ECe) levels of 0.7, 4.2, 8.1, 16.3 and 32.5 dS m-1 and exchangeable sodium percentage (ESP) levels of 1.1,15.2,30.6,61.4 and 88.7 in an alluvial silty clay loam soil (Fine-loamy mixed hyperthermic Typic Ustochrept) by addition of different salts. Pongamia pinnata failed to grow at a level of ECe 32.5 dS m-1 and ESP at and above 30.6. Height, girth, fresh weight and dry weight of upischolar_mained plants at the time of termination of experiment were found to have decreased with increase in ECe or ESP. Uptake of Na+ by plants increased progressively with increase in ECe or ESP levels, while the uptake of Ca++ decreased and Mg+ and K+ did not exhibit any definite relationship with increase in salinity or sodicity conditions. The values ofNaIK, Na/Ca and Na/Mg ratios in plants increased with increase in Ece or ESP. Relatively lower uptake of Ca++ due to high concentration of exchangeable Na+ appeared to increase the adverse effect of sodium on plant growth in saline and sodic soils.
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