Comparison of AquaCrop and ORYZA in Simulating Yield, Biomass and Water Use Efficiency of Three Rice Cultivars under Different Cultivation Methods

In order to simulate rice yield, biomass and water use efficiency using two crop models, AquaCrop and ORYZA, this research 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 showed that AquaCrop model had acceptable accuracy for simulation of rice yield based on MBE (0.36 ton.ha-1), RMSE (1.07 ton.ha-1) and NRMSE (0.14) values. Above mentioned values for ORYZA were 1.07 ton.ha-1, -0.06 ton.ha-1 and 0.14, respectively. RMSE, MBE and NRMSE values for biomass simulated by AquaCrop were 1.20 ton.ha-1, 0.07 ton.ha-1 and 0.32, respectively. The mentioned values for biomass simulated by ORYZA were 0.69 ton.ha-1, 0.04 ton.ha-1 and -0.22, respectively. NRMSE for biomass simulated by AquaCrop and ORYZA were 0.22 and -0.22, respectively. MBE, RMSE and NRMSE values for water use efficiency simulated by AquaCrop for -0.11 kg.m-3, 0.4 kg.m-3 and 0.15, respectively. Those values for water use efficiencies simulated by ORYZA were -0.03 kg.m-3, 0.4 kg.m-3 and -0.13, respectively. MBE, RMSE and NRMSE values for water use efficiency simulated by AquaCrop were -0.11 kg.m-3, 0.4 kg.m-3 and 0.15, respectively. Those values for water use efficiency simulated by ORYZA were -0.03 kg.m-3, 0.4 kg.m-3 and -0.13, respectively. Regarding the results, it is recommended to use ORYZA model for simulation of rice yield, biomass and water use efficiency.