A greenhouse experiment was conducted to investigate the effects of salt stress and ozone on yield and yield components of cucumber. The treatments were defined by a two-factorial design of three irrigation water salinity levels (2, 4 and 6 dS/m) and three ozone concentrations (0, 0.5 and 1 ppm). After germination, cucumber seeds were grown in pots containing soil, coco peat and perlite and fed with Hoagland's solution and were imposed with salt and ozone treatments. The results showed that salinity of irrigation water significantly reduced fruit yield of cucumber owing to a decrease both in fruit number and fruit weight. Also, statistical testing showed significant reductions in vitamin C, fresh and dry weight of shoot and root with increasing water salinity. Ozonated water improved fruit yield by increasing fruit number, but had no significant effect on fruit weight. Application of ozone caused significant increases in fresh and dry weight of shoot and leaf area but caused a significant decrease in the vitamin C. Generally, using ozonated water irrigation can induce positive effect on cucumber under salt stress. In conclusion, the saline water in combination with ozone could be recommended in strategic management to grow cucumber (without impaired effects on crop quantity).
In order to investigate the effect of drought stress and ozone on some properties of cucumber, a factorial experiment with complete randomized design was carried out in greenhouse at Khorasgan University, Isfahan, Iran in 2014. Experimental treatments were drought stress including three levels 100% (control), 80% (mild stress) and 60% of field capacity (severe stress) and three ozone concentrations in irrigation water (0, 0.5 and 1 ppm). After germination, cucumber seeds were grown in pots containing soil, cocopeat and perlite and fed with Hoagland solution and were imposed with drought stress and ozone treatments. The fruit weight per pot, stem thickness, ash weight, number of leaf and weight of root (fresh and dry) were determined. The results showed that across the ozone concentrations, drought stress significantly reduced fruit weight, leaf number, dry and fresh weight of root. Also, across the levels of drought stress, statistical testing showed a significant increase in fruit weight with increasing ozone concentrations. However, the highest (91.51 g) fruit weight was obtained at the third level of ozonated water (1 ppm) and 100% FC and for stem thickness (10.2 mm) was 60% FC and without ozone. The highest leaf number (48), fresh weight (6.22 g) and dry weight (2.62 g) of root was revealed at the 0.5 ppm ozone and 100% FC.
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