The effect of waste lime application on the hydraulic conductivity and chemical composition of a saline-sodic soil during and after leaching
1996
Melese Eshetu (Awasa College of Agriculture (Ethiopia)) | Verplancke, W.J.H.
Soil samples collected from the harbor of Zeebrouge, Belgium, were analyzed and identified as a saline-sodic. Based on the average exchangeable Na present in the exchange complex of the soil, the amount of waste lime required to reduce the ESP to a desired level was predicted. Assuming complete replacement of the exchangeable Na by Ca, three different levels of waste lime (for replacing the exchangeable Na 100 percent, 75 percent and 25 percent) were prepared and incorporated into the soil. A laboratory soil column study was carried out to investigate the effect of waste lime application on the hydraulic conductivity and the composition of the soil solution during and after leaching. The results showed that leaching has resulted a change in the pH, electrical conductivity of the saturation extract (ECe), sodium adsorption ratio (SAR) and the exchangeable sodium percentage (ESP). Application of waste lime at a rate equivalent to the exchangeable Na present in the soil (100 percent treatment) was associated with an increase in the saturated hydraulic conductivity and a lowering of ECe, and exchangeable Na, after leaching as compared with other treatments (75 percent and 25 percent) and the control sample. No difference was observed between the 25 percent treated column and the control. The reduction in the ECe in all cases suggests a net leaching of salts from the soil column.
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