The correct selection of inflow discharge can improve surface irrigation performance. In this study some modified furrow inflow hydrograph shapes were introduced and evaluated for field conditions. A zero-inertia simulation model was modified and an automatic device was designed and used to apply these inflow hydrograph shapes. The Kostiakov-Lewis infiltration equation parameters and roughness coefficient were estimated by multilevel calibration method using zero-inertia model. Fertigation were studied for these inflow hydrograph shapes. The experiments were conducted on a furrow irrigation field with sandy loam soil texture. Three replications were used for each measurement. Samples from surface water were collected and analyzed for fertilizer concentration at different stations along the furrow. The results showed that the tailwater runoff decreased significantly for the modified furrow inflow hydrograph shapes as compared to the constant furrow inflow hydrograph shape. As the required irrigation depth increased, the difference of application efficiency between the constant and the modified furrow inflow hydrograph shapes increased and the application efficiency was higher for the modified furrow inflow hydrograph shapes as compared with the constant furrow inflow hydrograph shape. The fertilizer losses due to runoff decreased and the
