Abstract: A development and growth model of 3-D wheat root system was developed based on the principle of GREENLAB model. Greenhouse experiments were carried out to measure the structure and biomass of wheat root for calibrating and evaluating the model. The simulated results showed that the model can be used to describe the structure dynamics of root system of wheat in homogenous soil. The comparison between simulated and measured accumulated root length showed that the value of RMSE ranged from 1.2 cm to 35.0 cm, the value of RE from 0.01 to 0.23, and the value of R2 from 0.42 to 0.94. Most of the simulated values fell within the variance of the measured ones. The sensitivity analysis showed that the change of parameters resulted in modest changes of simulated results. This model can provide a theoretical guide for precision irrigation and fertilization under further validation

Key words: wheat root system, functional-structural plant model, 3-D structure, automaton