Figure 5.

Comparison of water potential at the soil–root interface and of soil and root hydraulic conductance between sand and loam. (a,b) Water potential gradient at the soil–root interface (ψ _{soil_root}) with increasing transpiration rate and soil (ψ _soil) in sand and loam for both wheat and maize (from Figure 4a,d,i–l). (c,d) Difference between soil hydraulic conductance (K _soil) with increasing transpiration rate and root hydraulic conductance (K _root) in sand and loam for both wheat and maize [Color figure can be viewed at wileyonlinelibrary.com]