The field capacity (FC) and permanent wilting point (PWP) determinations were performed in the CITA laboratory with a pressure plate apparatus at pressures of 33 and 1500 kPa, respectively, according to Klute (1986). Disturbed soil samples were taken at several locations in each experiment with a 50 mm diameter auger. The particle size composition and the values of FC and PWP of the soils used in the two experiments are presented in Table 1 (means of three replications).