Fig. 2. Water gain and dye coverage of wheat seed suspended in holes of different diameter for 24 h. Error bars, where large enough to be seen, show standard error of the mean (n = 42). There were two zero diameter (no hole) positions in each soil block. Dotted lines indicate averages for the five runs with the greatest soil water potential (-0.07 MPa) and for the four driest (-1.3 MPa). Average soil water potential for all 42 runs was -0.16 MPa.