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Root system equivalent conductance or Krs ($$L^3 P^{-1} T^{-1}$$) can be described as the inverse Thevenin equivalent resistance of the root resistance network linking the plant collar to the soil. It describes how easily water flows through a root system.

It is one of the variables that can be use for the prediction of water stress in the plant. Moreover, this macroscopic parameter has a direct link to the root system architecture. The conductance network is sensitive to the radial and the axial conductivity of the roots. When the axial conductivity is the limiting factor, the root length has a reduced effect on the water uptake. The water that could enter the roots is not driven efficiently toward the shoot. On the opposite, when radial conductivity is the limiting factor, the absorbing root length matters to the water uptake.

Measurements
To measure the whole root system conductance, there are three known techniques. The Root pressure probe, the Scholander pressure bomb and the High Pressure Flow Meter (HPFM) measurements.