بررسی اثر سطوح مختلف شوری بر درصدجوانهزنی بذر گندم (رقم چمران)

Salinity stress is one of major agriculture problems that human was faced along thousands of years. So, this phenomenon caused huge reduction in agricultural potentions. Thus, this research designed to consideration of salinity stress effects on seed germination of wheat in 1392-1393. experiment was conducted in the laboratory of seed technology of Khuzestan Ramin Agricultural University .This study conducted in a completely randomized design with four replications. Treatments included control ( distilled water ) and five salinity levels ( 100 , 200 , 300 , 400 and 500 ) in terms of Mm. Description this test uses 3-parameter logistic model and Hill to result Hill showed that with increasing salinity , the time to reach 50 % of final germination of seeds (x50) found increase . Thus , by increasing the amount of stress from zero to 500 mM x50 from 32.39 to 132.73 hours of receipt and wheat seed treatment control ( distilled water ), the high and lowest levels of germination of treatments reached 500 mM . Finally, according to Logestic model the suitable concentration to reach50%germinationestimated 87.442mM.