Effect of Irrigation Frequncy on barley grain yeild and growth such as weight of straw, weight of 100 seeds , length of stalk , and number of seeds for three spikes were studies for two consequetive growing Sissons (1368 -1369 and 1369 1370) at Karaj Expriment Station , University of Tehran. The exprimental design used for this study was a randomized complete block design with four replications.The treats were four irrigation frequencies such as 2,7,14 and 21 days. the results showed that the 7-day irrigation frequency with 30% soil moisture depletion produced the maximum grain ycild (4 and 5.6 ton per hectar), 100-seed weight (4.09 and 3.9 gram), and stalk hught (70.7 and 95.4 cm), respectively.the heighest number of seeds per three spikes for two consequetive years (116 and 142),respectively, was obtained with irrigation frequency 2-day and 10% soil/moisture depletion.
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