evaluation of the rice growth model oryza2000 under nitrogen and water limited conditions )calibration and validation)

abstract to evaluated oryza2000 model in iran, this study was carried out during 2004 till 2007 at rice research institute of iran, rasht. the experiment was conducted as split plot in complete randomized block design and three replicates. three irrigation levels were the main plots and four levels of n application were allocated sup-plots model. simulated and measured values leaf area index (lai) and biomass of leaves, panicles, total aboveground biomass and crop n dynamics, was evaluated by adjusted coefficient of correlation; t-test of means; and absolute and normalized root mean square errors (rmse). results show that, with normalized root mean square errors (rmsen) of 5–51%, oryza2000 satisfactorily simulated crop biomass and n uptake that strongly varied between irrigation and nitrogen fertilizer. yield was simulated with an rmse of 155–464 kg ha-1 and a normalized rmse of 3–11%. simulated lai generally exceeded measured at low rates of nitrogen application. results show that, oryza2000 could be used successfully to support n and irrigation management under the limited conditions.