Fig. 5.

(A) Capacitance of barley plants growing in compost as the water table was increased (see Fig. 1) with values expressed relative to the final wetted capacitance. Data are means of 35 plants. Symbols represent individual plants. (B) Relationship between capacitance and the area of tissue in the stem cross-section of 20 barley plants measured with the water table at the compost surface. The linear regression, forced through the origin, is y = 1·3 ± 0·02x (R² = 0·926). (C) Relationship between the shoot capacitances of 43 barley plants measured before and after their excision. The line indicates a 1:1 relationship. (We could identify no obvious reason for the single outlier plant in A.)