All the statistical analysis were computed using R (version 3.1.0,R Development Team, Vienna, Austria), and results were considered significant at P < 0.05. The ANOVA (analysis of variance) test was used to evaluate the effects of irrigation methods on tuber yield.Because of different weather conditions between the two grow-ing seasons, we only used the 2013/2014 data to construct theANOVA table. Linear regression model was performed to investi-gate the association between moisture content and water table at