In Algeria, 95% of the territory is subject to an arid and semi-arid climate. Agricultural production is affected by constraints related to low and irregular rain-fall as well as heavy evaporation. Barley is a very cultivated cereal crop in Algeria, it is often subjected to water stress that greatly affects production. Under these conditions, the search for techniques that allow the plant to use water more effi-ciently is necessary.\nThe objective of this work is to study the effects of water stress and seed-ling date on the growth and yield of eight early and late-winter barley genotypes in the El Hmadna region (northwestern Algeria) in semi-arid conditions. \nThe results of the morphometrical parameters show a dominance of geno-types subjected to early sowing, with plant height averages of 71,57 cm and leaf area of 22,36 cm2. The number of plants.m-2, ears.m-2 and grain yields are 186,5 plants, 392,66 ears and 27,97 Q.ha-1, respectively. Compared to early seeding, late-seeded genotypes record earliness at the heading stage of 102,89 days after sowing (DAS) and a higher thousand grain weight (TGW) of 42,52 g. The best yields are obtained with genotypes driven into early sowing. \n\nKeywords : barley, water stress, sowing date, supplemental irrigation.

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