A method for measuring aggregate water stability of dryland soils with relevance to surface seal development

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Abstract
This paper examines the potential for a test of aggregate stability-or more correctly, of the water-stable size distributions resulting from wetting-to be correlated with surface seal development and infiltration of rainfall under field conditions. Aspects of measurement of water stable aggregation considered include wetting method, sample depth, area, antecedent water content, and the use of whole soil rather than restricted dry aggregate size ranges, and the water stable size fractions likely to restrict water entry and form surface seals. From consideration of pore sizes likely to prevent direct entry of raindrops into the soil, it is concluded that surface seal development is likely to be related to the proportion of particles

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