Citric Acid Induced Potassium and Silicon Release in Alfisols, Vertisols and Inceptisols of India
2016
Chatterjee, Dibyendu | Datta, S. C. | Manjaiah, K. M.
To evaluate different mathematical models for describing cumulative release of potassium (K) and silicon (Si) from soil by citric acid, an experiment was carried out in packed columns with three contrasting soils of India representing Alfisols, Vertisols and Inceptisols. The soils were saturated with six concentrations of citric acid viz. 0, 5, 10, 20, 40, 100 mg L⁻¹ prepared in 0.01 M CaCl₂ solution and the soil solution was collected by liquid displacement method at 15, 30, 45, 60 day intervals and analyzed for K and Si. These data were fitted to mathematical models viz. linear, quadratic, exponential, logarithmic, and power to describe such release. The results revealed that largest release of K and Si was observed in the 100 and 40 mg L⁻¹ citric acid treatment, respectively. In general, the relationship between citric acid concentration and cumulative release of K and Si fitted well to quadratic equations (y = ax ² + bx + c). Release of K with time was fitted the best in power form (y = at ᵇ), while the release of Si was fitted the best in linear equation (y = mx + c). These empirical equations may help in understanding the behavior of the soils towards application of citric acid. Also, information deduced from mathematical models could help in explaining the release mechanisms and to estimate the potassium and silicon supplying power of soils due to the action of citric acid.
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