Browsing by Author "Jayeoba, O. J."

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    PREDICTABILITY OF PHYSICAL AND EMPIRICAL SOIL INFILTRATION MODELS ON A SANDY SOIL IN LAFIA, SOUTHERN GUINEA SAVANNA ZONE OF NIGERIA
    (Department of Agricultural Economics and Extension,Nasarawa State University, Keffi, 2011-10-12) Ogbe, V. B.; Jayeoba, O. J.; Amana, S. M.
    Prediction of soil infiltration is a major problem due to its variability and proper selection of the technique used to determine the parameters of the models which depend on the local soil characteristics. Field experiments were conducted to assess the predictability of Kostiakov-Lewis and Philip's models on a sandy soil and to compare the measured and predicted cumulative infiltration using these models under local condition. A double ring infiltrometer was used to carry out three measurements each at 30 m interval in three different strips of 100 m long and 30 m wide. A total of nine infiltration tests were conducted in thefield. From the values of cumulative infiltration and time interval measured, the models parameters were determined. Using the two calibrated soil infiltration models, predictions of the cumulative infiltration were made for each strip. GENSTAT package was use to analyze the results. The result of the study showed that the Kostiakov-Lewis model predicted the cumulative infiltration better than Philip's model with the average values of the slope between the measured and predicted for strips A, B and C as (1.042, 1.065, 1.073) and (1.170, 1.202, 1.221), respectively and coefficient of determination, f1 (0.999, 0.996, 0.995) and (0.993, 0.988, 0.986) respectively. The t-test result at 5% level is not significant with values (- 0.806, -0.851 and -0.717) and (-1.779,1.688 and -1.689) for Kostiakov-Lewis and Philip's models respectively and for strip A, Band C respectively which meant that both models were within the acceptable error limit