Abstract:

To provide the reference for regional adaptation and application of ORYZA2000 in Sichuan province, the model was calibrated by the field data of five rice varieties at seven agrometeorological stations, and evaluated by the dataset from above stations with the five rice varieties. The daily meteorological data over the growing period of single cropping rice for the studied sites were used as driving variables in ORYZA2000 model. Management measures and soil data were used as the input of the model. By the comparison between measured and simulated values of development stages, leaf area index (LAI), biomass and yield, the simulation capacity and performance of ORYZA2000 model were evaluated in single cropping rice area. The results showed that nutrition stage growth rate of Hexi-39 was largest, but reproductive stage growth rate of Hexi-39 was smallest. The nutrition stage growth rate of Ⅱyou-838 was smallest, but reproductive stage growth rate of Dyou-63 and Xianyou-2 were largest. ORYZA2000 model could simulate the phenology of five rice varieties with 1-2 days’ difference for flowering and maturity stages. Furthermore, the normalized root mean square errors (NRMSE) of different development stages were less than 1%. While the NRMSE of other rice parameters were 5.26%-10.01% for yield, 10.37%-19.19% for leaf area index, 13.17%-18.69% for aboveground biomass, 14.31%-20.41% for stem biomass, 18.95%-24.74% for green leaves biomass, and 20.85%-25.39% for panicle biomass．These results showed that ORYZA2000 model could satisfactorily simulate the dynamical process of growth and yield of five major rice varieties. In general, we could conclude that ORYZA2000 model was adaptable and could be applied in scenarios analysis study in single cropping rice area of Sichuan province.

Key words: Crop model, ORYZA2000, Single cropping rice, Major rice varieties, Sichuan province