PREDCTION OF SOIL MOISTURE CHARACTRIC CURVE BY USING VAN GENUCHTEN MODEL (1980) AND SOILPAR2 FOR SOME SOIL AT NINEVEH GOVERNORATE

Five locations were chosen, two of them at the university of Mosul (L1, L2), and the other at Al-Shalalat (L3), Baybokh (L4) and Khorsobad (L5), all of them were chosen different in vegetation cover at Nineveh governorate, to study the moisture content distribution, and the predicated moisture by using Van Genuchten (1980) and Soilpar2 program at four depths. Physical and chemical properties were determined, after soil samples were collected and air dry, then sieved through 2 mm sieve. Results revealed that high best fit between the measured moisture and predicted by Van Genuchten (1980) for all locations and depths at suction more than 50 Kpa, especially at 800, 1100 and 1500 Kpa respectivly, with a correlation coefficient (r) ranged between (0.93-0.99). Also, result showed that the measured and predicated values were not variable with depths for all locations. The reason for that related to homogenous of soil texture. On the other hand, the measured values were variable with the predicted by using Soilpar2 between locations and depths. High best fit between the measured and predicted values at 10 and 20 Kpa for all locations, with a correlation coefficient ranged between (0.85-0.98).