The total water use efficiency was 7.2 kg ha−1 mm−1. Irrigation schedule of the non-stressed treatment may be as follows: the first irrigation is at the vegetative stage, when after 40–50 days from sowing/elongation and branching stage, that is the end of May; the second irrigation is at the late vegetative stage, after 70–80 days from sowing/heading stage, that is in the middle of June; the third irrigation is at the flowering stage, approximately 50% level, that is the first half of July; and the fourth irrigation is at the yield formation stage, seed filling, that is the last week of July.