The effects of supplemental irrigation using catchment rainfall on water movement and production of rain-fed potato were studied by field experiments.The results showed that WUE of potato was higher in the supplemental irrigation treatment of 45 mm than other treatments at the seedling stage,and the storage of water in different soil depth was more least.With the increasing of irrigation amount,the production of potato was not increased significantly and WUE decreased significantly.The soil evaporation and ...