الفهرس 
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Abstract
A laboratory experiment was conducted at Agronomy Department Laboratory of Seed Testing, Faculty of Agriculture, Mansoura University, Egypt, during December 2012 to study the effect of salinity concentrations on germination and seedlings parameters of some canola cultivars. The experiment was carried out in factorial experiment in completely Randomized Design (CRD). The first factor included three cultivars of canola (Serw 4, Serw 6 and Serw 51). The second factor included ten concentrations of salinity as NaCl i.e. 0.0 (control treatment), 0.2, 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6, and 1.8 %NaCl). Seeds of canola cultivars were surface sterilized before start of germination test by immersion for 5 minutes in sodium hypochlorite solution, then repeatedly washed with distilled water. Random sample of 100 seeds per each treatment for each cultivar were allowed to germinate under the environmental conditions of Laboratory for Seed Testing in Agronomy Department, Faculty of Agriculture, Mansoura University, Egypt at 1st December 2012 as the rules of International Seed Testing Association on top filter paper in sterilized Petri-dishes (14 cm diameter) and each Petri-dish contains 25 seeds. Each filter paper was moistened as required with a water solution at ten different NaCl concentrations. The papers belong to each dish were replaced every two days to prevent accumulation of salt according to. Seeds are considered physiologically germinated when the radical pierced the coleorhiza and reach approximately 2 to 3 mm long.