Development and verification of soil water balance and crop growth simulation model

On the basis of Modularization Design and Object Oriented Programming concept, according to the characteristics of soil water process and crop growth, making use of Visual Basic language, soil water balance and crop growth simulation model with user-friendly interface was developed. Having soil parameters, crop parameters, weather data, the simulation system was verified in red rice soil. The results of field verification show that the relative errors between simulated and observed soil water contents in the layers of A(0～5 cm), B(5～15 cm), C(30～35 cm) in the winter wheat field are 7.0%, 8.1%, 4.5%, respectively. The relative errors between simulated and observed crop yield of wheat, early rice, late rice and maize are 6.7%, 2.4%, 5.3%, 1.9%, respectively.