infiltration rate at the research area in eastern Samar State University Salcedo campus

This study was conducted at ESSU Salcedo Research Area, Salcedo Eastern Samar using fabricated double ring infiltrometers to estimate the range of infiltration rates. Four (4) treatments were replicated three (3) times on a 0.12 hectare located at the southeast part of the Research Area. A total of twelve (12) samples were used. RCBD was used as the experimental design with slope as gradient. Result of the study revealed that the initial infiltration rate values ranges from 128.32 cm/hr to 167.96 cm/hr with a mean of 147.32 cm/hr, while the final rate ranges from 20.78 cm/hr to 28.15 cm/hr with a mean of 23.55 cm/hr. The mean proportionally to factor (β) was -0.036 per minute. The results were based on the initial soil moisture content ranging from 33.99% to 36.70% with a mean of 35%. Using nonlinear regression analysis, it was found out that Horton’s model yielded a coefficient of determination (R2) of about 83.9%. This means that 83.9% were explained by time factor while the remaining 16.1% were explained by other factors not included in the study. It can be implied that Horton’s model was applicable to clay loam soil to predict the initial and final infiltration rate and valid at the given initial moisture content. Thus, it is suggested that further study using other models of infiltration be conducted in summer when the soil is relatively dry. Longer duration of time for infiltration study be used to determine a more accurate prediction of infiltration of water into the soil.