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RICE GROWTH AND NITROGEN UPTAKE SIMULATION BY USING ORYZA (V3) MODEL CONSIDERING VARIABILITY IN PARAMETERS

ORYZA (v3) model was assessed by four water and nitrogen treatments for variability and uncertainty analysis in rice biomass accumulation and nitrogen assimilation simulation. It was accurate in simulating rice biomass accumulation and nitrogen assimilation with treatment specific parameters and performed relatively better under flooded irrigation with limited nitrogen conditions (FS). Variability in treatment specific calibrated parameters was low and fell within an acceptable range, with highest CV of 11.08% for stem biomass and 18.5% for leaf nitrogen content. Weakness in ORYZA (v3) was exposed when simulated by parameters from other treatments. Cross-validation errors for panicle biomass (WSO), total above-ground biomass (WAGT), amount of nitrogen in leaf (ANLV) or panicle (ANSO) were acceptable. However, WAGT accumulation for FS was identified better than others. For WSO, among all parameters datasets, it performed better for parameters of flooded irrigation with full nitrogen (FF) and FS. Similarly, FS parameter was superior to others in simulating ANLV, whereas, under limited water and nitrogen (NFS) was better for ANSO. The uncertainty index, standard deviation and range varied similarly in different treatments where FS treatment showed lower uncertainty as compared to others. Findings of the current study suggested that ORYZA (v3) model can efficiently be adapted under varying water and nitrogen limited conditions.