Fig. 3.

Schematic for root-hair growth. The root-hair geometry remains unchanged throughout the simulation. As the simulation progresses, the active portion of the root hair grows. The streamlines show an estimation of the nutrient transport as affected by the presence of the root hair. At t=0, the root hair is non-active and acts only to geometrically impede the transport of nutrient. At t=1 d, the root hair has grown to half its final length and acts partly to take up nutrients and partly as a geometrical impedance. Finally, at t=2 d, the root hair is fully grown. (This figure is available in colour at JXB online.)