الفهرس 
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Abstract
This work was postulated to study the effect of salinity on growth and yield of canola, as well as the chemical composition of the leaves and the seeds and oil content of seeds of quality and quantity. Two pot experiments were performed out at ”The Agricultural Experience Station of Mansoura University” during the two successive seasons of 2011/2012 and 2012/2013.
A split plot design with three replicates was conducted. Canola cultivars were the main plots. Salinity levels treatments were the sup-main plots.
Four cultivars of canola were planted: Seru 4, Seru 6, Seru 10 and Pactol.
Seeds were obtained from ”Ministry of Agriculture, Oil Crop Research Center” Giza, Egypt. Twenty seeds were planted in every pot, give 40 pots. Treatment was repeated with three replications, total number of pots in the study were 120.
Results obtained in the present study could by summarized as follows:
B. Effect of salinity: Decreasing in the values of the results obtained from all varieties the study with increasing salinity. Best results occurred with control treatment followed by treatment level of salinity of 0.3%.
A. Effect of cultivars: Data in First stage (60 days after planting), referred that Nitrogen was higher in Seru 10, both Phosphorus and Potassium contents were higher in Seru4. Sodium declined in Seru 10, as Chlorine was lower in Pactol.
B. Effect of salinity: An inverse relationship between salinity and Nitrogen, Phosphorus and Potassium concentrations in the leaves at different stages of growth, and finally in seeds. Direct proportion were observed in both Sodium and Chlorine with salinity in all over study stages.
C. Effect of interactions: Comparing all treatments, the best concentrations of Nitrogen, Phosphorus and Potassium have emerged with the control treatment.
B. Effect of salinity: There was an inverse relationship between salinity and oil content in seeds and so, the percentage of unsaturated fatty acids. While a direct relationship occurred between salinity and saturated fatty acids.
C. Effect of interactions: When comparing the results of the interaction between the cultivars and salinity, data gave the best results in all terms like oil percentage and the total content of unsaturated fatty acids and contain less erucic acid and harmful saturated fatty acids. Closer results found by the interaction between cultivars and 0.3% salinity as the best results compared to the control.
Among all canola cultivars in this study, Seru 4 was the best in vegetative growth, suitable chemical composition, richest in oil percentage, highest linoleic acid (omega 6) and the lowest content of erucic and arachadic acids.
Therefrom, we can get an edible oil from Seru 4 wherever the salinity level was less than 0.9%, both Seru 6 and Seru 10 when the salinity become less than 0.8% and Pactol when the salinity was less than 0.6%.
Consequently, most of Salt affected soils can be distributed in Egypt used economically, for canola production for its variable uses and oil in particular.