evaluation of crop growth models oryza2000, swap and wofost under different types of irrigation management

the models oryza2000, swap and wofost simulate the growth and development of rice under conditions of potential production and water limitation. the models were evaluated against a data set of field experiments. the study was laid out in rcbd with three replications for one traditional landrace, hashemi, carried out in 2005 at the rice research institute of iran in rasht. the irrigation managements were: i1 (continuous irrigation); i2, i3, and i4 (irrigation at 1, 3 and 5 days, respectively, after disappearance of ponded water) and i5 and i6 (irrigation at 5 and 8 day intervals, respectively). in this paper, simulated and measured leaf area index (lai), biomass panicles, total aboveground biomass and yield by adjusted coefficient of correlation (r2), and absolute and normalized root mean square errors (rmse) were compared. on average, rmse total aboveground biomass was 653 kg/ha for oryza2000, 458 kg/ha for wofost and 589 kg/ha for swap. rmse biomass panicles biomass was 375 kg/ha for oryza2000, 284 kg/ha for wofost and 335 kg/ha for swap. rmse lai was 0.41(-) for oryza2000, 0.53(-) for wofost and 0.5(-) for swap. oryza2000, in contrast to wofost and swap, simulated the yield of rice well.