Values of u for PRD depended on wetting and drying cycle (Fig. 1B). For example, at 100 DAFB, the uvalue on wetted side of rootzonewas 0.26 while 0.16 m3 m3 was recorded for the dry side. Mean u of two sides of PRD treatment remained above 0.19 m3 m3 for the entire season (Fig. 1B).