Interpretation of soil physical parameters based on few measurements is sometimes difficult because of the spatial variability of the soil. Spatial variability in a salinesodic soil was evaluated by measuring field-saturated hydraulic conductivity (kfs) and infiltration rate (lR) in the field. The high coefficient of variation of 69 and 46 for Kfs and IR, respectively indicated the inherent soil variability of the study soil. The cumulative probability plots for Kfs and IR revealed near normal distrihution of the data. Method to asses the numher of field measurements needed for the evaluation of a particular soil physical parameter at a certain probability level is described. Depending upon the variability, it is suggested to take at least 10 field measurements for reasonable evaluation of soil's permeability to water.
