The Study of the Parametric Changes in Water Potential Points by Using Waste Manuciple Compost in Three Kinds of Soils

The water is the most important limitation factor for agricultural expanding in Arid and Semiarid region like Iran. Increasing irrigation efficiency is one of the methods for saving the water. Hence good management and use of skilled methods for keeping more water in soil due to optimum exploitation of limited source water of Iran is needed. So, the aim of this study was to increase the water maintenance in three kinds of soils by using 2, 4 and 7 (weight percent) waste manuciple, after that the measured water in different suction (0, 300, 500, 1000, 3000, 5000 and 15000) cm by three kind of models of water retention curve (Van‏ Genuchten, Brooks-Corey and Campell) by RETC software to befit. The results showed that waste manuciple compost increased all moisture content especially saturation content and by increasing the field capacity moisture increased available water in soil. The Van‏ Genuchten model had the best fitting to measured data at these additive by maximum R2 (0.99) and minimum RMSE (0.05).