The effect of leaching and industrial waste product on the aggregate stability of a saline-sodic dredged
1996
Melese Eshetu (Awasa College of Agriculture (Ethiopia)) | Verplancke, W.J.H.
As long as high concentration of salts in maintained in the soil solution, the aggregate stability of some saline sodic soils remains high irrespective of the high exchangeable sodium percentage. However, leaching of these soils with low salt water reduces their stability and leads the soil to poor physical conditions and to become more susceptible to erosion. Application of industrial waste product as a source of Ca can help in maintaining the stability of the aggregates and improving the physical condition of the soil. Different levels of waste lime (Ca (OH)2) were prepared and incorporated into the soil. The sample were leached with a saline water of an ECW of 2.1 mS/cm. After leaching, the samples were air-dried and passed through an 8 mm sieve. Using the dry and wet sieving method of De Leenheer and De Boodt (1959) the aggregate stability of the native sample (before leaching) and the control and treated samples after leaching were determined. Comparison was made between the different treatments using the stability index (SI) and aggregate stability curves. The results showed that leaching of the saline-sodic soil without application of the waste product significantly reduced the stability of the aggregates as compared to its stability before leaching and the stability of the treated samples after leaching. Application of the waste product at higher doses (100 percent and 75 percent replacement) better maintained the aggregate stability of the soil. However, application at a lower dose (25 percent) did not show any difference from the control.
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Эту запись предоставил Ethiopian Institute of Agricultural Research