The wheat cultivars sown in the S1, S2, S3, and S4 fields were Mehregan, Chamran, Sirvan, and Sirvan, respectively. All these cultivars are locally bred for the hot to semi-hot climates. Mehregan is an early-maturing cultivar, is suitable for delayed sowing dates, and is resistant to terminal water and heat stresses. Chamran is a medium-maturing cultivar and is a high-yield cultivar under normal and sufficient irrigation. Sirvan is a semi-early-maturing and high-yield cultivar and is resistant to terminal water stress. Wheat seeds were sown at the rate of 200 kg ha⁻¹ from 20th Nov. until 5th Jan. in the studied fields. The Granstar herbicide was applied in 30–40 g ha⁻¹ in the studied fields around 80 days after the sowing date. The triple super phosphate fertilizer was used at the rate of 150–200 kg ha⁻¹ between the sowing date and flowering. Five soil samples per field were taken at the depths of 0–0.3, 0.3–0.6, and 0.6–0.9 m to determine soil textures and soil hydraulic properties (Table 1).