Optimizing Budburst and Yield in Superior Seedless Grapevines Using Supplementary Dormancy-Breakers | ||
| Journal of Plant Production | ||
| Articles in Press, Accepted Manuscript, Available Online from 08 November 2025 PDF (485.05 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2025.434460.1524 | ||
| Authors | ||
| M. S. Gawish* 1; Marwa M. Mosallam2 | ||
| 1Horticulture Department, Faculty of Agriculture, Damietta University. Damietta, Egypt. | ||
| 2Department of plant production, Faculty of Environmental Agricultural Sciences, Arish University, North Sinai, Egypt. | ||
| Abstract | ||
| In this study, superior Seedless grapevines were pruned during the winter to retain 10 fruit canes (FCs), each with 10 buds. On 8th of January, all vines were treated with a 5% hydrogen cyanamide (HC) spray, serving as the control treatment. For the four additional treatments, the vines received the same HC spray, supplemented by an additional dormancy-breaking agent (SDBA) applied on 16th of January to the basal five buds of each FC to promote budburst. The SDBA treatments comprised either HC (2.5%), potassium nitrate (KNO₃; 2%), ammonium nitrate (NH₄NO₃; 2%), or zinc sulfate (ZnSO₄; 2%). By mid-March, shoot and cluster thinning was conducted to retain the six most vigorous shoots per FC and the largest 30 clusters per vine. The results indicated that all supplemental dormancy-breaking treatments enhanced budburst and bud fertility compared to the control (5% HC alone). These treatments also increased yield per vine and cluster weight. Furthermore, they significantly improved 100-berry weight, berry firmness, detachment force, juice TSS/acid ratio, leaf number per vine and per shoot, leaf-to-cluster ratio, as well as the length and thickness of new canes relative to the control. | ||
| Keywords | ||
| Grape; Grapes; Dormex; potassium nitrate; ammonium nitrate; production; quality. DormancyBreakers; zinc sulphate; budburst | ||
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