Drought stress is one of the most important limiting factors in crop production. Priming is one of techniques for improving seed germination, increasing stress tolerance and seedling establishment under low moisture conditions. A laboratory experiment was conducted to evaluate effects of different primings agents and duration on sesame seed. A factorial experiment base on completely randomized design (CRD) with three replication were conducted in the seed science laboratory of College of Agriculture Isfahan University in 2009. In this experiment nine seed treatments ( control, -2, -5 -10 and -15 bar poly ethylene glycol, 0/3, 1 and 2 molar NaCl and hydropriming with distilled water) were as first factor and five treatment periods ( consist 4, 12, 16, 24 and 48 hour) were as second factor. Germination percentage, germination rate, radicle and shoot length and dry weight were measured. Osmotic potential treatments with PEG solution in low level and hydropriming with different duration enhanced percentage and rate of germination, radicle and shoot lengths and dry weight in comparison with control and halopriming with high concentration of NaCl. Osmopriming for 24 hour was the best among the other primings, therefore it was selected for field experiment was conducted at the Agricultural Research Farm of Isfahan University of Technology in 2009 to evaluate treatment and different irrigation regimes on experiment sunflower. In field main-plot consisted of four irrigation regimes (75, 100, 120 and 150 mm cumulative evaporation from
