Abstract
In the current study, the effect of water deficit stress or drought on relative water content and cell membrane stability of dragonhead (Dracocepha lummoldavica) was studied in a greenhouse experiment carried out at Islamic Azad University, Jiroftbranch, in 2009. It was a split plot experimentbased on Randomized Complete Block Design with three replications, in which vertical factor included three levels of drought stress (irrigation when soil moisture reached 75% of field capacity [mild stress], irrigation when soil moisture reached 50% of field capacity [moderate stress] and irrigation when soil moisture reached 25% of field capacity [severe stress]). The highest dry yield of vegetative body in dracocephalum was obtained by mild stress as 4868.27kg/ha. The highest dry yield of vegetative body in dracocephalum as 5719.67kg/ha was obtained by application of 40 ton/ha of manure. considering essential oil content as the main goal of dracocephalum production and concerning the fact that oil yield as 13.10, 9.91, 9.91 and 9.91 kg/ha was achieved by interaction of the two factors in mild stress and 40ton/ha manure, mild stress and 30ton/ha, medium stress and 40ton/ha manure and medium stress and 30ton/ha manure, respectively; the medium drought stress together with application of 30tpn/ha is recommended for Jiroft region as the superior treatment which resulted in production of 9.91kg/ha essential oils.
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