This study was conducted to investigate the effect of drought stress and plant density on yield and some yield components of wheat cultivars in Boroujerd Agricultural Research Station in 2019-2020. The experiment was performed as a split factorial in a randomized complete block design. The main plots belonged to drought stress treatments (at three levels of control, irrigation to flowering, and irrigation to grain filling). The sub-plots consisted of plant density treatments (300, 400, 500, and 600 plants m−2) and cultivars (Mihan and Baharan). The results showed that drought stress, density, and cultivar treatments influenced grain yield components, and the interaction of stress ×plant density significantly affected plant height and spike length. The interaction of cultivar × stress significantly influenced plant height, 1000-seed weight, grain yield, and flag leaf area index. The interaction of cultivar × density was also significant on plant height, spike length, and internode diameter. The highest plant height (87 cm) was obtained in the treatment of 600 plants/m2 without applying drought stress. The highest plant height among all treatments belonged to the Baharan cultivar cultivated at a density of 600 plants/m2. The spike length was higher in full irrigation treatment and at the level of 500 plants/m2 than in the other experimental treatments. The dry weights of flag leaves were 2.8 and 3 g in Mihan and Baharan cultivars, respectively. The highest 1000-seed weight (43.7 g) in the Mihan cultivar at the level of complete irrigation treatment increased by about 12% compared to that in irrigation....
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