Figure 2.

(A) Exponential relationship between root electrical capacitance (C_R in nanofarads, nF) of maize plants and relative water saturation of soil (θ_rel). Plants M1–M15 in order of increasing root dry mass. (B) Exponential relationship between relative root electrical capacitance (C_rel) and relative water saturation of soil (θ_rel). C_rel is the ratio of C_R to the root capacitance C_R^* measured in water-saturated soil (θ_rel = 1) for the given plant. The regression equation was obtained from the model fitted to the whole data set (n = 150; thick solid line).