Yield and Water Use Efficiency Simulation of Different Rice Cultivars under Various Cultivation Methods Using AquaCrop and SWAP

So as to simulate rice yield and water use efficiency using AquaCrop and SWAP models, a research study was conducted at Khuzistan Agricultrual Research Station. In this study, three types of cultivation (D1: transplanting, D2: current directs seeding consorted seeding, and D3: dry bed seeding) and rice cultivars (V1: Red-Anbori, V2: Champa, V3: Danial) were considered. Results of MBE (0.36 ton.ha-1), RMSE (0.1.07 ton.ha-1) and NRMSE (0.14 ton.ha-1) showed that AquaCrop had good accuracy for simulation of rice yield. Mentioned statistical criteria for yield simulated by SWAP were 0.54 ton.ha-1, 1.09 ton.ha-1 and 0.15, respectively, which showed a good accuracy for this model. MBE, RMSE and NRMSE values for water use efficiency calculated by AquaCrop were -0.11 kg.m-3, 0.40 kg.m-3 and 0.15, respectively, and by AquaCrop were -0.10 kg.m-3, 0.40 kg.m-3 and 0.15, respectively. Average difference between observed and simulated yield by AquaCrop and SWAP were 0.64 ton.ha-1 and 0.67 ton.ha-1, respectively. Those values for water use efficiency were 0.02 kg.m-3 and 0.025 kg.m-3, respectively. The results revealed that both AquaCrop and SWAP had acceptable accuracy for simulation of different rice cultivars yield and water use efficiency under various cultivation types, however, AquaCrop had a bit better accuracy.