The study by Nielsen, Biggar, and Erh investigates the spatial variability of soil-water properties in a 150-hectare field following irrigation. The research focuses on infiltration, redistribution, and hydraulic conductivity, with measurements taken at 30.5 cm intervals up to 182.9 cm depth in twenty randomly selected plots. Tensiometers were used to measure hydraulic gradients, and soil-water contents were determined from soil cores. The results show that soil-water content varies normally with depth and horizontal distance, while hydraulic conductivity follows a log-normal distribution. The clay fraction is significantly correlated with hydraulic conductivity at the 1% level. The study also examines various equations for predicting water movement and retention under field conditions. The authors propose simplified methods for determining hydraulic conductivity and flux, and estimate variability in the field as a homogeneous unit. The detailed analysis of soil profile, including particle-size distribution, soil-water characteristic curves, soil bulk density, storage, soil-water flux, and hydraulic conductivity, is presented, highlighting the spatial variability and the impact of soil heterogeneity on water movement.The study by Nielsen, Biggar, and Erh investigates the spatial variability of soil-water properties in a 150-hectare field following irrigation. The research focuses on infiltration, redistribution, and hydraulic conductivity, with measurements taken at 30.5 cm intervals up to 182.9 cm depth in twenty randomly selected plots. Tensiometers were used to measure hydraulic gradients, and soil-water contents were determined from soil cores. The results show that soil-water content varies normally with depth and horizontal distance, while hydraulic conductivity follows a log-normal distribution. The clay fraction is significantly correlated with hydraulic conductivity at the 1% level. The study also examines various equations for predicting water movement and retention under field conditions. The authors propose simplified methods for determining hydraulic conductivity and flux, and estimate variability in the field as a homogeneous unit. The detailed analysis of soil profile, including particle-size distribution, soil-water characteristic curves, soil bulk density, storage, soil-water flux, and hydraulic conductivity, is presented, highlighting the spatial variability and the impact of soil heterogeneity on water movement.