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 growing seasons, we only used the 2013/2014 data to construct the ANOVA table. Linear regression model was performed to investigate the association between moisture content and water table at