Figure 6.

Variation of soil hydraulic conductance (K _soil) and root hydraulic conductance (K _root) for varying transpiration rates (from dark blue to yellow, note that same colour does not mean same transpiration rate) as a function of soil matric potential ψ _soil: soil matric potential. (a,b,c,d) Wheat grown in repacked sand, undisturbed clay loam, repacked clay loam, and loam. (e,f) Wildtype and mutant (root‐hairless brb) barley grown in sandy loam. (g,h) Same barley genotypes as (e,f) grown in chromosol soil. (i,j) Wildtype and mutant (roothairless 3) grown in sand. (k,l) Same maize genotypes as (i,j) grown in loam. (m) Maize grown in sandy loam. (n) Millet grown in sandy loam. (o,p) Tomato with long and short root length grown in sandy loam, respectively. (q) Tomato grown in sandy loam.The same colour is used for the titles of similar soil textures [Color figure can be viewed at wileyonlinelibrary.com]