Effect of drought Stress as water deficit and Plant density on yield roselle (Hibiscus sabdariffa) in Jiroft region

In order to investigation drought (water deficit) and Plant density on roselle (Hibiscus Sabdariffa) the research was conducted at research farm of Jiroft Islamic Azad University during 2009. The experimental design was split plot based on RCBD with three replications. Drought stress (water deficit) were selected based on different percentage of field capacity (FC)، in 4 Levels (no stress، 75% FC، 50% FC and 25% FC) were selected as main plots and plant density Levels (20، 40، 60 and 80 plant per square meter) were arranged on sub plot. The results showed that، effect of water stress on calyx yield، weight fruit، dry weight، weight seed per plant and plant height were significant (= 0. 01). Effect of Plant density on calyx yield، fruit number per Plant، Weight fruit and dry Weight were significant (= 0. 05). Water deficit، significantly reduced calyx yield from 617. 5 to 430. 8 Kg/ha in 25% FC treatment. The highest calyx yield obtained from water deficit treatment 75%FC (660. 8 Kg/ha). The highest amounts of calyx yield 576. 7 Kg/ha were observed from plan density treatment (40 plants/m2) But No significantly with Plant density (20 plants/m2). Finally about roselle، irrigation in 75%FC and plant density 20-40 plants per m2 for the Jiroft region was recommended.