The lowest WUE (0.056 t ha−1 mm−1) realized for the SI treatment can be ascribed to the fact that the 175% more water was applied to this treatment than the DI + TM, while yield of the SI method was 59% of the DI + TM treatment. These results are also in agreement with those of Doss and Evans (1980), Drost and Hefelbower (2004), Kirnak and Demirtas (2006), Ngouajio et al. (2006) and Seyfi and Rashidi (2007).