Studies the Effect of Alternative Dormancy Breaking Agents on “Le-Cont” Pear Cultivar | ||
| Journal of Plant Production | ||
| Article 4, Volume 7, Issue 9, September 2016, Pages 943-950 PDF (415.45 K) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2016.46850 | ||
| Authors | ||
| M. M. Makarem; Nevine M. Taha; Naglaa H. Shakweer | ||
| Horticulture Research Institute, ARC., Giza Egypt. | ||
| Abstract | ||
| This study was carried out during two successive seasons of 2013 and 2014, to investigate the effect of alternative dormancy breaking agents on bud break, growth, yield and fruit characteristics of “Le-Cont” pear cultivar. The following treatments were investigated at the dormant bud stage; 2% Garlic extract (GE) + 4% Summer oil; 4% GE + 4% (summer oil); 2% hydrogen cyanamide (H2CN2) + 4% (summer oil); 4% H2CN2 + 4% (summer oil); 2 % urea phosphite (CO(NH2)2.H3PO3) + 4% (summer oil); 4 % (urea phosphite) + 4% (summer oil); 4% Summer oil alone. The effects of all treatments were compared with the control (untreated trees). It is noticed that the beginning of flowering to all treatments resulted in early flowering and shorter than the control. All treatments increased both bud burst percentage and floral bud percentage; especially garlic extracts at the highest concentration. Garlic extract and urea phosphite concentration gave the highest number of fruits/tree and yield kg/tree also fruit weight, size and their dimensions have been affected. Hydrogen cyanamide 4 % and urea phosphite 2 % gave the softener fruits. In addition, all treatments was affected to increase TSS, total and reducing sugars than control treatment. Hormonal changes during the rest period in flower buds of Le-Conte pear were determined in the 2nd season of the study. The highest levels of IAA and GA3 contents were found to be in endo-dormancy (on the end of Feb.), while Abscisic acid showed the highest values during the 1st deep dormancy (on the end of Dec.). It was a remarkable increases in IAA and GA3 occurred at bud swelling stage. Meanwhile, the lowest level of ABA was observed at the same stage. | ||
| Keywords | ||
| Le-Conte pear cultivar; bud break; hydrogen Cyanamid; urea phosphate; mineral oil; flowering; yield; fruit quality. | ||
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