2.5. Statistical analysis
All data were subjected to the analysis of variance (ANOVA) appropriate to the experimental design to evaluate the effects of treatments on the yield and yield components of potato. CoStat (Version 6.311, CoHort, USA, 1998–2005) was used to conduct the analysis of variance. Comparison of treatment means was carried out using the least significant difference (LSD) at 5% probability level. Regression analysis was performed between total seasonal water use and total tuber yield of the crop. Linear regression analysis was conducted to identify relationships between total tuber yield and number of tuber per plant and average tuber weight per plant.