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<p>Incomplete dormancy release due to insufficient winter chilling is a major constraint to apple (<i>Malus domestica</i> Borkh.) production in tropical highland environments. This study evaluated the effects of hydrogen cyanamide (1.5%), garlic extract (15%), and their combined application on bud phenology, reproductive performance, yield, and fruit quality of three low-chill apple cultivars (‘Anna’, ‘Dorsett Golden’, and ‘Princesa’) under Ethiopian highland conditions over two consecutive seasons (2023–2024). Data were analyzed using a linear mixed-effects model with repeated measures across the two growing seasons. Dormancy-breaking treatments significantly advanced bud break by 15–24 days and shortened flowering duration from 7 to 8 weeks in the control to 3–5 weeks in treated trees. The combined hydrogen cyanamide + garlic extract treatment produced the earliest bud break and the highest flowering percentage (up to 67%), fruit set (up to 19%), fruit number (up to 63 fruits tree⁻¹), and yield (5.0–6.0&#xa0;kg tree⁻¹) across cultivars. Yield improvement was associated with increases in fruit number and fruit weight. Significant cultivar × treatment interactions (<i>P</i> &lt; 0.05) were observed for most phenological and reproductive traits, demonstrating differential cultivar responsiveness to dormancy-breaking agents. Conversely, total soluble solids and fruit firmness were not significantly affected by treatment, cultivar, or their interaction (<i>P</i> &gt; 0.05). These findings indicate that combining low-chill cultivars with dormancy-breaking treatments partially compensates for inadequate winter chilling and improves apple productivity under tropical highland conditions.</p>

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Effects of hydrogen cyanamide and garlic extract on dormancy release, yield, and fruit quality of low-chill apple cultivars at Debre Tabor, northwestern Ethiopia

  • 期刊论文

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  • 发表日期：

    2026年8月1日

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  • Dessie Fisseha Bitew,
  • Daniel Ayalew Mengistu,
  • Melkamu Alemayehu Workie

摘要

Incomplete dormancy release due to insufficient winter chilling is a major constraint to apple (Malus domestica Borkh.) production in tropical highland environments. This study evaluated the effects of hydrogen cyanamide (1.5%), garlic extract (15%), and their combined application on bud phenology, reproductive performance, yield, and fruit quality of three low-chill apple cultivars (‘Anna’, ‘Dorsett Golden’, and ‘Princesa’) under Ethiopian highland conditions over two consecutive seasons (2023–2024). Data were analyzed using a linear mixed-effects model with repeated measures across the two growing seasons. Dormancy-breaking treatments significantly advanced bud break by 15–24 days and shortened flowering duration from 7 to 8 weeks in the control to 3–5 weeks in treated trees. The combined hydrogen cyanamide + garlic extract treatment produced the earliest bud break and the highest flowering percentage (up to 67%), fruit set (up to 19%), fruit number (up to 63 fruits tree⁻¹), and yield (5.0–6.0 kg tree⁻¹) across cultivars. Yield improvement was associated with increases in fruit number and fruit weight. Significant cultivar × treatment interactions (P < 0.05) were observed for most phenological and reproductive traits, demonstrating differential cultivar responsiveness to dormancy-breaking agents. Conversely, total soluble solids and fruit firmness were not significantly affected by treatment, cultivar, or their interaction (P > 0.05). These findings indicate that combining low-chill cultivars with dormancy-breaking treatments partially compensates for inadequate winter chilling and improves apple productivity under tropical highland conditions.