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The article discusses a one-year study of the competitive ability of Cynosurus cristatus and its yield in simple mixtures. The experiment was conducted in boxes 16 inch square, located on the roof of the Memorial Building at the University College of North Wales in Bangor. During the study period, the species showed a seedling survival potential of less than 50 percent, poor competitive ability, heavy mortality as a result of heavy defoliation. At a seeding rate of 5 pound/acre the inclusion of Cynosurus cristatus in a simple mixture reduced the incidence of Agrostis tenuis in the seeding year and did not reduce the total yield.