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Improving crop yield and wheat water productivity depends on certain factors, the most important of which is the selection and cultivation of high-yielded with less water consumption. In order to obtain high-yielding bread wheat cultivars with high water productivity, an experiment was conducted in the form of randomized complete blocks for three years from 1396 to 1399. In this experiment, the main treatment included four levels of water (50%, 75%, 100% and 125% water requirement) and the sub-treatments included four new cultivars (Chamran 2, Mehregan, Shoush and Barat) as control and 7 promising lines with three replications. bread Wheat lines were selected from the Elite experiments of 1395 (lines 3, 9, 12, 13, 15, 16 and 17) . Evapotranspiration was calculated based on the evaporation pan method and irrigation treatments were applied using drip irrigation system. While recording growth stages, at the time of harvest, samples of treatments were taken to measure yield and yield components. In simple and combined analysis of variance, the number of grain per spike, thousand kernel weight, dry matter produced, harvest index, grain yield and water use efficiency based on grain yield and dry matter produced were investigated. In the combined analysis of variance, the effects of the year on the treatments were significant. In this study, the average wheat evapotranspiration in the three years of the experiment was 342, 231 and 225 mm, respectively. In annual combined treatments, it was found that By selecting the cultivar and managing it appropriately, water productivity can be increased from 51 until to 63%. In relation to applied water with grain yield and water productivity, it was found that with a 10% deficit in water required for bread wheat, 6% of yield and water productivity is reduced. The best recommendation for deficit irrigation in warm areas is to supply 90% of the water requirement of wheat. Based on evapotranspiration or water requirement, grain production capacity, tolerance to water stress and less yield changes in annual variable climatic conditions, lines 9, 12 and 13 and Mehregan and Barat cultivars were superior.
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