الفهرس 
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Abstract
Two experiments were carried out in at private greenhouse Fayoum Governorate, Egypt (8.5 × 40 m, 2.7 height), during successive winter seasons of 2018/2019 and 2019/2020 to study the effect of application of some antioxidants, i.e., salicylic acid and ascorbic acid at 50, 100 and 200 mg/l of each, beside unsprayed treatment, some stimulants, i.e., sodium selenate (2, 4 and 6 mg/l), humic acid (1, 2 and 3 g/l), and potassium silicate (4 and 6 ml /l) as foliar spray on growth, yield, and fruit quality on cucumber (Cucumis sativus L). cv. Barracuda F1 hybrid. Foliar spray of cucumber plants grown under plastic house conditions with salicylic acid at 200 mg /l was the best treatment for increasing dry weight of shoots and total yield, as well as dry matter content and TSS, whereas spraying with ascorbic acid at 200 mg /l enhanced the concentration of vitamin C in fruits. The increases in total yield/square meter were about (39.4 %) average two seasons for SA at 200 mg /l than unsprayed plants. On the other hand humic acid (HA) at 3 g/l and potassium silicate (KSil) at 6 ml /l as foliar spray gave the tallest plant and HA at 3 g/l gave the maximum values of leaves number, fresh weight of leaves, branches and shoots of plant, dry weight/of leaves, branches and shoots/plant at 75 days after planting, aslo number of early fruits/plant, average early fruit weight, early yield/plant and early yield /m2. in both seasons, number of total fruits/plant, average fruit weight, yield/plant and total yield/m2 were the best with foliar spray with humic acid at 3 g /l and KSil at 6 ml/l, followed by HA at 2 g/l and KSil at 4 ml /l in both seasons, while sodium selenate at 2, 4 and 6 mg/l gave the lowest values of dry weight compared to HA at 1, 2 and 3 g /l and KSil at 4 and 6 ml/l in both seasons.