Abstract
The effect of exchangeable sodium percentage (ESP) on the availability of Ca from added gypsum (Ca45SO4. 2H2O) and chemical composition, dry-matter yield and uptake of nutrients by dhaincha (Sesbania aculeata) and maize (Zea mays) in the presence and absence of supplementary source of available Ca in the root zone has been investigated. Increasing levels of ESP has a depressive effect on the dry-matter yield of plant and it is more sharp in maize as compared to dhaincha. Supply of available Ca in the root zone has not shown any spectacular effect on the dry-matter yield. Increasing ESP caused a gradual decrease in Ca and increase in Na content of both the species in both the series, although the effect was more pronounced for maize in -Ca series. In general, there was an increase in the contribution of Ca from added gypsum with the increase in exchangeable Na in soil. Applied gypsum contributed considerably more Ca todhaincha as compared to maize specially at higher Na saturation. Maximum contribution of Ca from added gypsum went upto 31 per cent of the total Ca taken up bydhaincha and 17 per cent in maize. The results show that availability of Ca in gypsum is influenced considerably by the levels of exchangeable Na in the soil as well as the species of plant grown.
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