Measuring the infiltration rate (IR) in different types of soil is very important to determine the optimum irrigation application rate (i.e., discharge) to prevent the surface run-off, that causes a decrease in the productivity of the land as a result of the loss of seeds, fertilizers and irrigation water. Therefore, researchers tend to use high-accuracy field measurements of IR (i.e., double ring method) to reach the precise actual values of IRs in different soils that help in setting up suitable irrigation system and intensity rate of irrigation water to allow only suitable flux based on the soil infiltrability and eliminate losses through run-off. To reach this goal field and laboratory measurements were conducted to evaluate IR and chosen related soil properties. The obtained results of the study concluded the following:
The differences in the values of the IR are attributed to the changes in the physical properties of the soil due to the variation of soil textures, which leads to the heterogeneity of the soil grains, which greatly affects the IR; the differences in the bulk density of the studied soils affect the geometry of the soil particle and pore sizes distribution which resulted in large extent on IR; as a result of the heterogeneity of the soil particles size, the smaller ones fill the spaces between the large particles, which limits the porosity and thus reduces the IR; the presence of calcium carbonate improves the permeability up to a certain limit, but when it increases such limit, this leads to reduction in soil permeability; employing mathematical equations, developed based on statistical analysis of the relationship between IR and the soil properties (physical, chemical and hydro-physical properties), are useful in reducing the time and effort required to conduct the double ring experiment; the results of the significant relationships at 99% and 95% confidence limits between the results of using mathematical equations to infer infiltration rates showed satisfied significance (R2 value) for most of the results of the studied physical, chemical and hydro-physical soil properties; statistically, this method can be used under the soil's conditions of the study area, with the need to implement it in different types of soils for the purpose of validating the obtained regression equations to reach similar accuracy as the field measurement of IR using the method of double-ring infiltrometer.