Methods are described for measurement of the permeability to water and air of individual soil aggregates. The use of wax coatings as an external framework permits the application of water potential gradients or air-pressure gradients across exposed surfaces of the aggregates. Aggregates as small as 8 mm diameter are used. The applications are modifications of established techniques used to study flow through soil cores. Initial results from the flow properties for aggregates are compared with measurements on soil cores. The air permeabilities were greater than the water permeabilities probably because of air entrapment in the latter case. The permeabilities of soil cores were greater than those of the individual aggregates presumably because of the existence of preferential flow paths between the aggregates in the cores.
|Number of pages||6|
|Journal||Journal of Agricultural and Engineering Research|
|Publication status||Published - Sep 1996|