Abstract
Simple procedures for estimating soil aggregate stability by the water-drop method and ultrasonic dispersion are compared for a wide range of soils from Colombia, Kenya, Lesotho, Luxembeurg and Spain. For both methods, two test procedures are compared. All of the procedures give similar results. For the most unstable soils, the simple form of the water-drop test provides the best resolution, but this procedure is not suitable for the more stable soils. The longer water-drop and low-energy ultrasound procedures do not appear to produce different amounts of breakdown products in the site-fractions examined. Aggregate disruption by wet sieving also produced a similar size range of breakdown products. Recommendations are made concerning the most appropriate test for soils similar to those tested. Both water-drop impact and ultrasonic dispersion procedures were found to be consistent and reproducible.
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