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The soil moisture characteristic can be approximated from limited data as a composite of segments that are simple logarithmic relations. From available data, three segments are evident: (1) a capillary segment from saturation to pF 2.5, (2) an adsorbed film segment covering the stress range from about pF 2.5 to about 5.0, and (3) a tightly adsorbed segment that extends from pF 5.0 to 7.0.

Comparisons of relative infiltration of summer thundershowers into undisturbed and treated western dry lands are necessary for guidance of future treatment practices. A system designed for measuring infiltration of simulated rainfall into' smalt plots of undisturbed soil that can be handcarried to sites inaccessible to vehicles has been developed. Disturbance of surface soil by driven plot frames or cylinders, a primary source of errors in infiltration measurement, has been eliminated in this design. Water requirements have been reduced to 1 or 2 gallons per measurement; so, distilled water or controlled chemical solutions can be used. Accurate measurements can be made rapidly and economically.