Impact of Spraying ‘Early Sweet’ Grapevines with Gibberellic Acid and Urea for Reducing Shot Berries Percentage and Improving Yield and Cluster Quality | ||
| Journal of Plant Production | ||
| Articles in Press, Corrected Proof, Available Online from 23 November 2025 PDF (508.65 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2025.438290.1529 | ||
| Author | ||
| Doaa M. Hamza* | ||
| Mansoura University, Faculty of Agriculture, Pomology Department, Egypt. | ||
| Abstract | ||
| The presence of shot berries in the Early Sweet grapevine cultivar poses a considerable challenge that negatively affects grapevine productivity and fruit quality, making it crucial to find certain treatments to minimize their prevalence and increase grapevine yield. Field experiments were conducted at Horticulture Research Institute experimental farm, Mansoura, Egypt, using a completely randomized block design with three replicates during 2021 and 2022 successive seasons. The experiment includes five treatments i.e., T1) control, spraying only with tap water; T2) spraying with 1 ppm gibberellic acid (GA₃) and 0.5 g/L low biuret urea twice during full bloom and at 25% fruit set; T3) same as T2 plus spraying with 10 ppm GA₃ at 7-8 mm berries diameter; T4) same as T2 plus spraying with 10 ppm GA₃ and 20 ppm GA₃ at 7-8 mm and 10-12 mm berries diameter respectively, and T5) same as T2 plus spraying with 20 ppm GA₃ at 10-12 mm berries diameter. The findings showed that spraying GA₃ along with urea during different growth stages significantly boosted both yield and quality of berries compared to control treatment. However, treatments of GA₃ and urea, particularly (1–10 ppm and 1–20 ppm), resulted in higher acidity levels and a slight reduction in soluble solid content (SSC) and SSC/acid ratios. Among the treatments, T4 showed the lowest percentages of shot berries, accompanied by a significant increase in yield, cluster weight, berry weight, diameter, and total chlorophyll concentration in berry skin, while reducing total carotenoid concentration in berry skin. | ||
| Keywords | ||
| Gibberellic acid (GA3); Low-biuret urea; ‘Early Sweet’ grapevines; Shot berries | ||
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