About Us
ORYZA: A crop growth simulation model for rice
ORYZA version 3 (ORYZA v3), or simply ORYZA, is an ecophysiological model which simulates growth and development of rice including water, C, and N balance (Bouman et al., 2001; IRRI, 2013) in lowland, upland, and aerobic rice ecosystems. It works in potential, water-limited, nitrogen-limited, and NxW-limited conditions. And it was calibrated and validated for 18 popular rice varieties in 15 locations throughout Asia.
Since 2009, ORYZA2000 has been modified from a crop model toward a cropping model aimed mainly at abiotic stress. The modeling group in International Rice Research Institute encourages tests and applications of ORYZA and welcomes feedback. The modeling group also provides minor tech support to users.
The model development
Following the "School of de Wit," ORYZA has evolved through various versions, including ORYZA2000 v2.13, v2.12, v2, and v1, which are integrated successors of ORYZA1 (Kropff et al., 1994), ORYZA_W (Wopereis et al., 1996), and ORYZA_N (Drenth et al., 1998). ORYZA2000 v2.12 and v2.13 were respectively integrated into cropping system models APSIM and DSSAT as APSIM-ORYZA (2005) and DSSAT-ORYZA (2012) to facilitate rice simulations in different cropping systems.
A new version 3.2 of the ORYZA crop model has been expanded from the officially released version 3 in 2022 and 2023. Please note that version 3.2 is still in the testing phase and is not yet mature. We are pre-releasing it to collect user feedback on bugs and suggestions for improvement before the official release. You are welcome to use it freely at your own risk, and we encourage you to communicate with us regarding any questions or concerns about version 3.2.
The ORYZA crop model - released version
Status and capabilities
ORYZA now has extended range of application from single to multiple rice crop simulations. Comparing ORYZA v3 and v2.x , ORYZA v3 (ORYZA) generates outputs that include effects coming from combined irrigation water management options, interacting water and N uptake, soil carbon and nitrogen dynamics, nitrogen balance based on N-fertilizer management , organic fertilizer input, daily minimum and maximum temperature, soil temperature, plant density, rice root growth, climatic and abiotic stresses, greenhouse gas (CO2 and N2O), and plant responses to drought and nitrogen deficiency stresses. ORYZA also has Linux edition specifically useful for numerous simulations.
ORYZA online application tools
The Rice Potential Yield Check (beta version) is an online web tool to check the potential yield of a rice variety at a given location when sown on a particular day of the year.
The ORYZA Online 2.0 is an online web tool for beginners in crop modeling to familiarize themselves with the input files needed, to run a basic simulation, and to visualize the results of the simulation.