An experiment was conducted to compare the ability of some antioxidants namely salicylic and ascorbic acids at 0.01-0.02g/l for each and nutrients namely boric, calcium, magnesium at 0.05-0.10g/l for each and potassium as a foliar spray at 0.7-1.4 g/l to decrease high temperature stress and to improve flower productivity of carnation plants. Calcium nitrite at 0.05 g/l was more effective than most of the other treatment for increasing plant height, leaf and flower numbers, fresh and dry weight of plants, pigments content of leaves and chemical composition. Calcium nitrate at 0.05 g/l as three foliar sprays at fifteen days intervals reduced the high temperature stress and improved number and quality of flowers of carnation plants.