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Abstract
The expanded growth model was developed to describe accumulation of dry matter and plant nutrients with time for annual and perennial crops. It incorporates an environmental driving function and an intrinsic growth function. Previous analysis has shown that the model applies to the annual corn (Zea mays L.) and the warm‐season perennial bermudagrass (Cynodon dactylon L. Pers.). In this article the model is used to describe accumulation of dry matter and plant nitrogen (N) by soybean (Glycine max L. Merr.). The model describes dry matter accumulation by the vegetative component of the plant followed by accumulation of dry matter and plant N with time by seeds and pods. Strong dependence of yields and plant N uptake on seasonal rainfall is illustrated.