Abstract
A greenhouse experiment was conducted to evaluate the effect of increasing exchangeable sodium percentage (ESP)viz. 11, 17, 35, 58 and 70 on the growth and the concentration of important macronutrients in needles and stems of Casuarina obesa Miq., C. glauca Sieb. ex. spreng., C. cunninghamiana Miq. and C. equisetifolia Forster and G. Forster. A significant increase in the dry matter was found with increasing soil sodicity. At ESP 70, the percentage increase in dry matter over ESP 11 for the first three species was 44%, 35% and 124% in the needles, and 78%, 37% and 86% in stems, respectively. On the other hand the yields of C. equisetifolia decreased with increase in soil sodicity. Among the 4 species, C. obesa and C. glauca produced comparatively more DM under sodicity than did C. cunninghamiana and C. equisetifolia. The effect of sodicity was more pronounced on needles than on stems. Sodium concentration in plant parts increased with increasing sodicity, whereas concentration of potassium, calcium, magnesium, nitrogen and phosphorus showed a decrease.
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