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<p>The present investigation assessed the seasonal accumulation of chilling and productivity in three apple cultivars—‘Gale Gala’, ‘Red Velox’ and ‘Jeromine’—at two environmentally contrasting hill stations of Himachal Pradesh, India, at YSP UHF Nauni (1300 m AMSL) and RHRTS Mashobra (2286 m AMSL) for 2&#xa0;consecutive years, i.e. from 2023 to 2025. Chill unit (CU) values from November to April were developed using hourly climate data and the Utah Model. Mashobra, at a&#xa0;greater elevation, had greater total chill (1212 CU) in 2023–2024 and (1183 CU) in 2024–2025 compared to Nauni (872.5) in 2023–2024 and (887.5&#xa0;CU) in 2024–2025, while the overall greatest chill occurred in December (365.5 CU at Mashobra and 288 CU at Nauni). ‘Jeromine’ was the best performer of all three cultivars at both locations, being calculated as 11.84 kg/tree (47.60 MT/ha) in 2023–2024 and 12.05 kg/tree (48.20 MT/ha) in 2024–2025 at Nauni and 11.52 kg/tree (46.30 MT/ha) in 2023–2024 and 11.74 kg/tree (46.96 MT/ha) in 2024–2025 at Mashobra. Overall yields at Nauni were slightly higher overall, albeit with lower chilling at Nauni. These results emphasized the value of cultivar selection, based on site-specific chilling profile to maximize apple production in the Himalayan region with an uncertain future climate.</p>

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Dynamics of Chill Accumulation and Yield Performance of Selected Apple Cultivars in Mid-Hill Regions of Himachal Pradesh, India

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Garima Vashisth,
  • Sanjeev Kumar,
  • Rupam Nehta,
  • Pramod Verma,
  • Ibajanai Kurbah,
  • Nitin Sharma,
  • Neena Chauhan

摘要

The present investigation assessed the seasonal accumulation of chilling and productivity in three apple cultivars—‘Gale Gala’, ‘Red Velox’ and ‘Jeromine’—at two environmentally contrasting hill stations of Himachal Pradesh, India, at YSP UHF Nauni (1300 m AMSL) and RHRTS Mashobra (2286 m AMSL) for 2 consecutive years, i.e. from 2023 to 2025. Chill unit (CU) values from November to April were developed using hourly climate data and the Utah Model. Mashobra, at a greater elevation, had greater total chill (1212 CU) in 2023–2024 and (1183 CU) in 2024–2025 compared to Nauni (872.5) in 2023–2024 and (887.5 CU) in 2024–2025, while the overall greatest chill occurred in December (365.5 CU at Mashobra and 288 CU at Nauni). ‘Jeromine’ was the best performer of all three cultivars at both locations, being calculated as 11.84 kg/tree (47.60 MT/ha) in 2023–2024 and 12.05 kg/tree (48.20 MT/ha) in 2024–2025 at Nauni and 11.52 kg/tree (46.30 MT/ha) in 2023–2024 and 11.74 kg/tree (46.96 MT/ha) in 2024–2025 at Mashobra. Overall yields at Nauni were slightly higher overall, albeit with lower chilling at Nauni. These results emphasized the value of cultivar selection, based on site-specific chilling profile to maximize apple production in the Himalayan region with an uncertain future climate.