الفهرس 
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Abstract
This study was conducted at Ezab Alkasr village, the New Valley Governorate during the 2004/2005 and 2005/2006 seasons to find out the effect of water or salicylic acid or/ and ascorbic acid on seed production of onion cv. Giza 6 Mohassan.
Three concentrations of salicylic acid or / and ascorbic acid were used, i.e. 0 ( water), 100 and 200 ppm. The control plants were not sprayed. A split-plot design with three replicates was used. Salicylic acid was distributed in the main plots and ascorbic acid was distributed in the sub-plots.
Onion plants were sprayed four times i.e., 50 days after planting, then at one-month interval between each two sprays.
Data was recorded and the obtained resulted are as follow:
Number of Umbles/ plant: Number of umbles had increased significantly when plants were sprayed with salicylic acid or/ and ascorbic acid, compared to the control plants. Spraying plants with water showed slight increase in this traits, in both seasons. The use of a concentration of 200 ppm of salicylic acid and ascorbic acid resulted in a highest number of umbles/ plant. The number of umbles was 7.73 and 7.53 with % increment of 61 and 31.4 in the first and second seasons, respectively.
2) Percentage of infertile flowers per Umble: Fertility had increased when plants were sprayed with water or salicylic acid or/ and ascorbic acid, compared to the control plants. Treating plants with 200 ppm of salicylic acid showed higher increases in this character from 80.13 to 90.63 and from 81.25 to 90.38 in the first and second seasons, respectively. whereas , ascorbic acid showed lower effect as compared with salicylic acid, in both seasons. The interactions of SA and AA at 200 ppm each had increased the fertility percentage from 77.5 to 91.79 and from 80 to 90.27 in the first and second season, respectively.
3) Weight of fresh Umble: Compared to the control plants, the weight of fresh Umble had increased significantly when sprayed with salicylic acid at concentration of 200 ppm and with ascorbic acid at 100 ppm , in both seasons. The interaction SA and AA at 200 ppm showed the most significant increases in this character, in both seasons
4) Weight of fresh Umbles/plant: The weight of fresh umbles / plant had increased significantly when plants sprayed with water or SA or / and AA as compared to the control plants in both seasons. Salicylic acid showed greater increases as compared with water or ascorbic acid. The interaction of SA and AA at 200 ppm showed the most significant increases, in both seasons.
5) Dry weight of Umble( gm): The weight of air dry umble increased significantly when sprayed with salicylic acid and ascorbic acid, compared to the control plants. SA at 200 ppm showed the highest values and AA was more effective at 100 ppm, in both seasons. The interaction of SA and AA each at 200 ppm resulted in the most significant increases, in both seasons.
6) Dry weight of Umbles / plant (gm): The weight of dry umbles/ plants significantly increased with spraying onion plants with water or SA or / and AA, in both seasons. The increments were 88% and 56 % for SA, 32 % and 13% for AA and 23 % and 11 % for water spraying in the first and second seasons, respectively. The most significant increases was obtained from the interaction of SA and AA each at 200 ppm and the increments were 142 % and 80 % for the first and second seasons , respectively.
7) Dry weight of seeds / Umble: In general, SA application showed the most significant increment as compared with plants sprayed with water or AA, in both seasons. The increment in this character was among fur values i.e. 3.2 , 22.7 and 6.4 , 5.1 % for water; 19 % and 24.7 % for SA; 23.5and 1.7 for AA; 61.6 and 31 % for the interaction of SA and AA at 200 ppm each in the first and second seasons, respectively.
8) Dry weight of seeds / plant ( gm): spraying onion plant with water or SA or/ and AA significantly affected this character, in both seasons. The increments as percentages in dry weight of seeds per plant as compared with control plants were 14.7 and 10.9 for water, 59.2 and 56.3 for SA , 43 and 15.9 for AA and 133.1 and 82.4 for SA x AA each at 200 ppm, in the first and the second seasons, respectively.
9) Dry weight of seeds per fed. (kg): application of either water or SA or / and AA significantly increased this traits, in both seasons. The increments as percentages due to these treatments were among four values i.e. 17.8, 13.9 and 17.3 , 11.5 % for water, 74.2 and 68.2 for SA, 52.5 and 22.4 for AA, and 176.7 and 104.7 for SA x AA each at 200 ppm, in the first and second seasons, respectively.
10) Dry weight of 1000 seeds(gm) : High significant increases in this trait were obtained due to foliar spray of water or SA or / and AA on onion plants, in both seasons. The increment as percentages in this character were among four values i.e. 7.9, 4.4 % and 10.3, 4% for water; 14.8 and 7.3 for SA, 13.3 and 6.7 for AA , and 27.5 and 12.4 for the interaction of SA and AA each at 200 ppm in the first and second seasons, respectively.
11) Seed germination percentage: Seed germination percentage significantly increased when plants were sprayed with water or salicylic acid or/ and ascorbic acid, compared to the control plants. However, the most significant increases were in the percentage range of 7.5 % for ( 0 x 2005 SA) in the firs season, and 8.5 % for SA x AA at 200 ppm in the second season.
from the results obtained it could be concluded that foliar spray of both salicylic acid at 200 ppm and ascorbic acid at 200ppm on onion plants may be recommended. This treatment achieved the most significant increases in all reproductive growth parameters particularly seed quantity and quality under New Valley Governorate environmental conditions