الفهرس 
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Abstract
A field experiment was carried out on Cymbopogen citratus plant during two summer years of 2011 and 2012 at a private farm located in New-Domiata, Domiate Governorate, to study the effect of three irrigation intervals (3, 6 and 12 days) and two foliar applications with Super Bluegreen and/or Super Cetrin at (75, 100 and 150 ppm) on yield and essential oil production and composition of lemongrass. The physical and chemical properties of the oil were determined and are included in this study. G.L.C. separation of the essential oil revealed 6 identified compounds (myrcene – limonene – linalool - neral (citral b) - geranial (citral a) and genaryl acetate). Generally observed, that the main components of lemongrass oil was neral (citral b) and geranial (citral a) which achieved the largest values.The obtained results showed that:Irrigation intervals every 12 days increased essential oil % and oil yield per plant and per fed, in addition to the main components (citral) in lemongrass leaves.Foliar spraying with Super Cetrin gave the highest values of all characters compared to Super Bluegreen in the both years. -Essential oil % and oil yield per plant and per fed were higher in the first cut than to the second cut during the two years especially in the second year.Highest essential oil % and oil yield per plant and per fed and the main components (citral) percentage were significantly increased by the mixture of foliar application (Super Bluegreen + Super Cetrin) at 100 ppm in both years.Therefore, it could be recommended that irrigation intervals every 12 days and foliar application with the mixture of Super Bluegreen + Super Cetrin at the rate of 100 ppm maximize the lemongrass essential oil yield and citral content.