الفهرس 
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Abstract
A field experiment was conducted at the Agriculture Faculty Farm, New valley University during 2017/2018 and 2018/2019 seasons to study the response of five canola cultivars to foliar spray by some antioxidants. The field experiment was carried out in a randomized complete block design (RCBD) using a strip plot arrangement with three replications. Antioxidants application (Control, Citric, Ascorbic, Citric+ Ascorbic) were allocated horizontally, while five canola cultivars (Pactol, Tpaz, Serw 4, Serw 6 and AD 201) were assigned vertically. Canola seeds were hand sown on rows 60 cm distance in hills 20 cm apart on 1st and 3rd November in the first and second seasons, respectively. Control plants were treated with water (without antioxidants) while the others were sprayed by the certain concentration of antioxidants. All sprayed treatments were done at 45 days after sowing. The preceding summer crop was maize in both seasons. All other recommended cultural practices for canola crop were done in both seasons. The results obtained in this study could be summarized as follows: -
V.A-Yield attributes trait:-
V. A- 1- Plant height (cm):
The obtained data reveal that the interaction between antioxidants and canola cultivars had a significant effect on plant height in the first season only. While, the effect of interaction failed to be significant at 5% level of probability in the second season. Whatever, the highest mean values of plant height (167.60 and 163.84 in the first and second seasons, respectively) were obtained from Serw 4 plants which were sprayed by 200 ppm Citric acid.
V. A- 2- Number of racemes /plant:
Data show that the interaction between antioxidants and canola cultivars had a significant effect on number of racemes /plant in the first season only. While, the effect of interaction failed to be significant at 5% level of probability in the second season. The highest mean values of number racemes /plant (8.56 and 8.89 in both seasons) were obtained from Serw 6 plants which were sprayed by 200 ppm Citric acid.
V. A- 3- Number of silique/plant:
The illustrated data reveal that the interaction between antioxidants and canola cultivars had a highly significant effect on number of siliques /plant in both seasons. The highest mean value of siliques number /plant (161.1 and 148.0 in the two respective seasons) were obtained from Serw 4 which were sprayed with Citric acid only.
V. A- 4- Number of seeds /silique:
The exhibited data show that the interaction between antioxidants and canola cultivars had a highly significant effect on number of seeds /silique in both seasons. The highest mean values of seeds number/silique (32.04 and 32.92 in the first and second seasons, respectively) were obtained from AD 201 plants which were spread by 200 ppm Citric + Ascorbic acid in the first season and Serw 6 cultivar which were spread by Ascorbic acid in the second season.
V.A- 5- Thousand seed weight (g)
It evident from the data that the interaction between antioxidants and canola cultivars had a highly significant effect on 1000- seed weight in the both seasons. The highest mean value of 1000- seed weight (3.54 g) was obtained from Serw 6 plants which were sprayed by 200 ppm Citric acid in the first season. While, the highest mean value in the second season (3.44 g) was obtained from Serw 4 which was sprayed by 200 ppm Ascorbic acid.
V. A- 6- Seeds weight/plant (g):
The presented results reveal that the interaction between antioxidants and canola cultivars had a highly significant (P≤0.01) and significant (P≤0.05) effect on seeds weight /plant in the two respective seasons. The heaviest mean value of seeds weight/plant (16.39) was obtained from Serw 6 plants which were sprayed by 200 ppm Citric acid in the first season. While, the heaviest mean value in the second season (16.94) was obtained from Serw 6 plants which were sprayed by 200 ppm Ascorbic acid
V. B- Seed and oil yield:-
V. B- 1- Seed yield (kg/fed.):
Data reveal that the interaction between antioxidants and canola cultivars had a highly significant (P≤0.01) effect on seed yield /fed in both seasons. The highest mean values of seed yield/fed (971.8 and 1020.5 kg/fed in the first and second seasons, respectively) were obtained from Serw 6 plants which were sprayed by 200 ppm Citric acid.
V. B- 2- Seed oil percentage (%):
The obtained results show that the interaction between antioxidants and canola cultivars had a highly significant effect on seed oil percentage in the first season. While, had a significant effect only in the second season. Pactol plants which were sprayed by 200 ppm Citric+Ascorbic acids gave the highest mean values of seed oil percentage (42.59 % and 38.71% in the first and second seasons, respectively).
V. B- 3- Oil yield (kg/ fed.):
The exhibited data show that the interaction between antioxidants and canola cultivars had a highly significant effect on oil yield /fed in both seasons. Serw 6 plants which were sprayed by 200 ppm Ascorbic in the first season and Citric acid in the second season gave the highest mean values of oil yield (379.60 and 379.10 kg/fed in the two respective seasons).