Click on image to view larger version.
FIG. 2. Effects of localized (i) nutrient supply and (ii) physical constraint on the root system architecture of a monocotyledon and a dicotyledon. Root system architecture of a barley plant (Hordeum vulgare cv. Proctor) (A) uniformly supplied with nitrate or (B) supplied with nitrate through a banded treatment. The banded treatment triggered root proliferation in the zone of nitrate supply (Drew, 1975). Comparison of the architectures of two Lupinus angustifolius root systems: (C) physically unconstrained growth conditions, and (D) taproot growth stopped by a physical obstacle at an early developmental stage.
