Fig. 1. Illustration of plastic rectangular pots (51 by 28 by 36 cm) used for the experiments. Zero-tension displacement (ZTD) sampling port(1), suction sampling port using porous tubes surrounded by a glasswool–sand layer (PT-S) (2), and suction sampling port using porous tubes (PT) (3). Centrifugation (CFG) sampling used soil taken from depth 5 to 10 cm.