Effect of the Fluctuations of Heat on Growth, Fruiting and Yield of Some Plum Cultivars under Kalubia Governorate | ||
| Horticulture Research Journal | ||
| Volume 3, Issue 7, September 2025, Pages 91-106 PDF (703.16 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/hrj.2025.464409 | ||
| Authors | ||
| M.A. Fathi; Y.I. El-Naggar; Nevein, M. Taha; R.D. Darwish | ||
| Deciduous Fruits Research Department, Horticulture, research Institute, Agric. Res. Center, Giza, Egypt. | ||
| Abstract | ||
| This study was carried out on three Japanese plum cultivars (Prunus salicina L.), namely Hollywood, Pionear and Aspani, grafted on Marianna plum rootstock (P. cerasifera). Six-year-old trees planted at 4 × 4 m spacing (260 trees/Fed.) under flood irrigation at El-Kanater Research Station, Egypt, were sprayed on 23 January, 1 February, or 15 February during the 2022/2023 and 2023/2024 seasons with 0.5, 1.0, or 1.5% hydrogen cyanamide (Dormex, H2CN2) combined with 3% summer oil (Caple 2).Hollywood trees exhibited the earliest flowering (18–22 February), fruit set (15–16 March), and harvest (1–18 May), along with the shortest flowering and fruiting durations. Hollywood fruits also showed higher TSS and TSS/acidity ratio, lower acidity, and greater fruit number, firmness, and net income in the first season. Pionear produced the highest yield, better flowering overlap with the other cultivars, and superior fruit number, firmness, weight, size, and economic return during the second season. Aspani recorded higher fruit set percentage and larger fruits in one season. Overall, the results indicate that Hollywood and Pionear cultivars perform most favorably under the tested conditions. It is recommended to spray these cultivars with 1.5% Dormex + 3% Caple 2 on 15 February when trees accumulate approximately 74–109 °C ≤ 7.2 °C and 326–393 h ≤ 10 °C to achieve earlier flowering, improved fruit set, higher yield and quality, and greater economic returns. | ||
| Keywords | ||
| Plum Cultivars; Hallywood; Pionear; Aspani Flood Irrigation; Breaking Agent | ||
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