Abstract: 【Objective】In order to realize more accurate virtual growth of rice, a dynamic model was developed to analyze geometrical parameters of leaf blade based on outputs of rice growth model. 【Method】 Based on the experimental observations, the relationships between the tiller leaf blade length and its synchronously emerging leaf blade length on main stem and between leaf blade length and its width were quantified. Then, coupled with simulation models of leaf age, leaf area and tiller number of rice, a general model for predicting geometrical parameters of rice leaf blade was developed. 【Result】 The ratio of tiller leaf blade length to its synchronously emerging leaf blade length on main stem changed with tiller leaf number in quadratic equation and the relationship between leaf blade length and its width could be expressed in power function. The validation of the model with independent experimental data indicated that the model could simulate the geometrical characteristics of rice leaf blade under different growth conditions. 【Conclusion】 This study has provided a reliable and general method for modeling the geometrical parameters of rice leaf blade and reflected the morpho-physiological patterns of geometrical parameters of crop organs as affected by environmental conditions and variety types.

Key words: Rice, Leaf blade, Geometrical parameter, Growth model, Virtual growth