Canola Irrigation Scheduling using AquaCrop Model in Qazvin Plain

Irrigation planning caused to achieve high crop yield and economic benefit. Regarding that, AquaCrop model was used to determine canola irrigation scheduling. At first, optimum depth of irrigation (Iw) and irrigation depth for maximum yield (Im) were determined. Then, these two irrigation depth (Iw and Im) were used to simulate 12 scenarios (T1-T12) for each Im and Iw using calibrated AquaCrop model. The results showed that Im and Iw were 53 and 45 cm, respectively. The highest values for yield and biomass in both Iw (2432 ton.ha-1) and Im (2496 ton.ha-1) irrigation depths were obtained in scenario FI. The highest WUE values using Im were obtained for T8, T11, and T6 as 0.65, 0.63, and 0.58 kg.m-3, respectively. For Iw irrigation depth, the highest WUE values were obtained for T11, FI, and T8 as 0.33, 0.37, and 0.38 kg.m-3, respectively. To put in nutshell, Treatments T8, T11 and T6 are recommended for achieving high WUE and acceptable yield (1832, 1566, 1876 ton.ha-1 using Im and 1264, 1169 and 1189 ton.ha-1 using Iw) in this region.