Effect ِof Flower Thinning and Spraying with Gibberellic Acid and Ethephon on Yield and Fruit Quality of Manfalouty Pomegranate Cultivar

Abstract

This investigation was executed during two successive seasons of 2006 and 2007 at the Experimental Orchard of Fruit Section, Faculty of Agriculture, Assiut University on Manfalouty pomegranate cultivar. Fifty trees of Manfalouty pomegranate cultivar were selected and divided into ten treatments; each treatment represented five trees (Replicates). The study aimed to investigate the effect of flower thinning and ethrel with or without GA 3 spraying on yield and fruit quality of this cultivar. The treatments consisted of: manual thinning of all the flowers appeared during the last week of May till the end of flowering period, spraying with gibberellic acid (GA 3 ) at 50, 100 and 150 ppm. , flower thinning + spraying with GA 3 at 100 ppm., spraying with Ethrel at 1000 ppm. , spraying with Ethrel at 1000 ppm + GA 3 at 50, 100 and 150 ppm and the control (water spraying). The study indicated that flower thinning recorded the highest number of grade I fruits. Flower thinning and the flower thinning + spraying caused a significant decrease in the fruit numbers of grade III while the remained treatments showed insignificant differences.

The impact of calcium chloride, potassium nitrate and flower thinning on yield component and fruit quality of Manfalouty pomegranate cultivar

“…Also, the early flower thinning increased the commercial fruits and TSS/acid ratio was significantly decreased in the later than the early waves of fruit set. Likewise, the hand thinning of pomegranate trees increased the fruit weight, weight of 100 arils, soluble solids contents, anthocyanin, ascorbic acid contents, total phenolic, antioxidant and decreased the yield and total acidity (Ahmed, 2007;El-Mahdy et al, 2010;Mohsen andOsman, 2015 andFattahi et al, 2020).…”

Study the Effect of Foliar Application of Gibberellic Acid (Ga3) and Liquid Calcium on Growth and Fruit Quality of Pomegranate Trees (Punica Granatum L.) Cv. Sawa

“…In addition, GA 3 increases the efficiency of photosynthesis by increasing the chlorophyll content and leaf area, leading to an increase in the size of the fruits (16). (19) mentioned that spraying with gibberellic acid led to an increase in diameter and length, and thus leads to an increase in its size and weight, also promotes growth by increasing the flexibility of the cell wall by hydrolyzing starch into sugars, which reduces the water potential in the cell, which leads to water entering the cell and causing it to elongate (41). The results of this study are consistent with the results obtained by (24, 35 and 49).…”