RESPONSE OF EARLY GRAND PEACH TO CHEMICAL THINNING; ETHREL, GIBBERELLIC ACID AND UREA. I. YIELD AND FRUIT QUALITY | ||||
| Journal of Plant Production | ||||
| Article 18, Volume 25, Issue 8, August 2000, Page 5267-5278 PDF (732.95 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2000.259569 | ||||
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| Authors | ||||
| Thanaa M. Ezz,1; Amal M. El-Kobbia2 | ||||
| 1Plant Production Dept., Fac. of Agric. (Saba Bacha), Alex. Univ., Alex., Egypt. | ||||
| 2Dept. of Pomology, Fac. of Agric. (El-Shatby), Alex. Univ., Alex., Egypt. | ||||
| Abstract | ||||
| The results of the two successive seasons of 1997 and 1998 revealed that chemical thinning with gibberellic acid (GA3), urea at pre-bloom stage and ethrel at post-bloom stage of Early Grand peach trees significantly reduced yield but increased fruit weight. In general, the three thinning treatments significantly increased both total soluble solids and vitamin “C”. As for juice acidity, it was increased by GA3, decreased by ethrel and was not affected by urea treatments. As for fruit firmness, data showed that ethrel reduced firmness in the meanwhile, it increased total soluble pectin. On the other hand, both GA3 and urea treatments produced firmer fruits as a result of reducing the total soluble pectin significantly. It was also found that total chlorophyll was significantly decreased with ethrel treatments and increased with both GA3 and urea treatments. In addition, carotene and anthocyanin were increased by ethrel and were not affected by both GA3 and urea treatments. Data of the present study showed that chemical thinning caused a general increase in total sugars, while total phenols were affected by ethrel only. | ||||
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