Figure 1
From: Preferential Root Tropisms in 2D Wet Granular Media with Structural Inhomogeneities
(a) Illustration of the 2D growth cell or rhizotron made of parallel plates with a gap of ≈1 mm. (b) 2D growth cell with intrusion. Inset images show the different parts of the set-up. (i) lentil shoots, (ii) lentil roots within pore spaces between glass beads, (iii) glass beads (as model soil) fully saturated with water, (iv) image of the inhomogeneity or intrusion (square rod) inserted inside the 2D granular medium. (c)Experimental scheme where all roots are regularly being replenished when water is lost via evaporation during the lag phase. After the lag phase, the roots may be subject to full saturation (regular replenishment) or partial saturation (no replenishment and evaporation allowed to take its course).
