الفهرس 
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Abstract
Objectives: This present study was carried out to evaluate the effect of foliar applications of some substances, i.e., Ca, Mg, B, Zn, and Se + VE as well as SA and yeast extract as antioxidant substances on growth, flowering, fruit setting, fruit yield and its component and chemical composition of some tomato cultivars. Methods & Results: 1- Two field experiments were carried out at EL-Baramon Research Station, Dakahlia Governorate, Egypt, during summer seasons of 2007 and 2008 to study the effect of foliar substances with calcium, magnesium, boron, zinc, selenium + vitamin E and salicylic acid as well as yeast extract on plant growth, flowering, fruit setting, fruit yield and its component and chemical composition of tomato (Lycopersicon esculentum, Mill) Castle Rock and Super Strain-B cultivars. 2- The two studied cvs. responded positively to all foliar application as for growth parameters compared to the control. However, the plants of Super Strain-B cv. treated with SA gave the tallest plants, while Castle Rock cv. treated with SA had more leaves/plant followed by B and Ca. In addition, Castle Rock cv. plants sprayed with B gave heaviest fresh and dry weight in the two studied seasons. 3- The interaction between cultivars and foliar applications in general increased all studied yield parameters compared to the control. Castle Rock cv. plants sprayed with B had the best number of fruits/plant, yield/plant, total yield (ton/fed.) and marketable yield (ton/fed.) followed by Ca. Plants of Castle Rock cv. when treated with Ca and B applications resulted in the highest records in average fruit weight and fruit volume. Conclusion: It can be concluded that spraying tomato plants cv. Castle Rock with boron at 50 mg/L, calcium at 2000 mg/L, salicylic acid at 100 mg/L and selenium at concentration of 50 mg/L mixed with vitamin E at concentration of 150 mg/L three times, starting 15 days after transplanting and repeated each 15 days interval could be of some value in improving tomato vegetative growth, flowering and fruit yield (ton/fed.) and quality under high temperature conditions of summer season under Dakahlia Governorate and such conditions. Consequently, further research trails should be carried out for improving tomato tolerance against adverse effect of high temperature stress under local condition.