The Effect of Shading and Spraying with Gibberellin and Their Interaction on Vegetative and Floral Characteristics of Jasmine Plant in Nurseries of Salah Al-Din Governorate

• Wisam Hussein Ahmed Al-Jumaili

  Author

The aim of this study was to investigate the effect of shading at four levels (0%, 30%, 50%, 70%) and spraying with gibberellin at four concentrations (0, 50, 100, 150 mg.L⁻¹) and their interaction on the vegetative and floral traits of the jasmine plant grown in the nurseries of Salah al-Din Governorate during the agricultural season 2024-2025. The experiment was carried out according to the design of the completely randomized blocks with three replicates. The results showed that the 50% shading level was significantly superior in all the studied traits, and the gibberellin concentration of 100 mg.L⁻¹ outperformed the rest of the concentrations. The interaction effect recorded that the double treatment (50% shading + 100 mg.L⁻¹) achieved the highest values for plant height (57.6 cm), number of leaves (33.5 leaves), leaf area (10.5 cm²), dry weight (21.3 g), number of full flowers (21.3 flowers), flower diameter (3.48 cm), calyx length (1.68 cm), and flower shelf life (11.2 days), achieving improvement rates ranging from 88% to 238% compared to the control treatment. The research recommended the adoption of 50% shading with spraying gibberellin at a concentration of 100 mg.L⁻¹ to improve the productivity and quality of the jasmine plant under the conditions of Salah al-Din Governorate, and to conduct future studies that include additional physiological measurements

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