Significant differences between water regimes (W) were observed for inulin content, inulin yield and WUEi (P ≤ 0.01) and significant differences among Jerusalem artichoke genotypes (G)were observed for all traits (Table 1). Difference in years (Y) was also significant for inulin content, inulin yield and WUEi. The inter-actions between water regime and Jerusalem artichoke genotype(W × G) were significant for inulin yield and WUEi (P ≤ 0.01). Genotypes × year (G × Y) interactions were significant for inulin yield and WUEi. Genotype × year × water interactions (G × Y × W) were also significant for inulin yield and WUEi. Two and three way inter-actions were not significant for inulin content, indicating that the genotypic rankings for inulin content were stable across years and soil moisture levels.