Abstract
AbstractThe capillary conductivity of beds of 0.5‐ to 1‐, 1‐ to 2‐, 2‐ to 3‐, 3‐ to 5‐, and 5‐ to 9‐mm aggregates separated from Nicollet, Kranzburg, Aastad, and Miami soils was determined over a suction range of from 0.02 to 12 bars by using the pressure plate outflow technique. When moisture content‐moisture suction relations were essentially unaffected by aggregate size, capillary conductivity was a function of volumetric moisture content. However, if moisture content‐moisture suction relations were affected by aggregate size, then at any given moisture content, conductivity values for a given aggregate size were inversely related to the suction corresponding to said moisture content. For beds consisting of mixtures of aggregate sizes, changes in moisture content‐moisture suction brought about by mixing, affected capillary conductivity in much the same way as in the case of beds of single‐sized aggregates. Data from sand and uniformly porous ceramic “aggregates” indicate that capillary conductivity is a function of size only if size affects moisture content‐moisture suction relations. Other factors influencing moisture retention may be expected to influence capillary conductivity accordingly.
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