Fig. 4.
A flow chart illustrating the computation of root growth in each soil layer. Dmax is the maximum rooting depth, which is a genetic characteristic of a given cultivar. Cl and BD are the soil clay content and bulk density, respectively. θ is the water content; T is the temperature; N is the N content; DVS is the specific developmental stage, and i indicates a specific soil layer. White valves indicate transformation rates. Dashed boxes are state variables taken from other modules and used as inputs for this module. The components in the circles including the external input data (solid line with a dot) and state variables from/to another module (dashed boxes) are information needed for rate computations. Thick solid lines represent the mass flow while thin solid lines illustrate information flow.