Effect of Girdling and Gibberellic Acid Application on Yield and Fruits Quality Characteristics of Balady Mandarin

Abstract

he present study was carried out during two successive of 2016 and 2017 on 10 years old Balady mandarin (Citrus reticulate Blanco) trees budded on sour orange rootstock (Citrus aurantium L. Osbeck) and spaced 3.5×3.5 meters apart. Trees have been treated with girdling and gibberellic acid and were grown in sandy soil under drip irrigation system in a private orchard at Alkamal region-Ismalia Governorate, Egypt, in July and December. The aim of this work was to study the effect of girdling and gibberellic acid on the vegetative growth, yield and fruit quality. The chosen trees girdled with 2 mm, 4 mm width and gibberellic acid was sprayed (at 50 and 100 ppm) alone or in combination with girdling in each season. Results showed that, girdling 4 mm+100 ppm gibberellic acid have given the best enhanced vegetative growth parameters in terms of leaf area, carbohydrate and chlorophyll contents in the leaves of Balady mandarin trees in both seasons. Moreover, treatment of girdling 4 mm in December and girdling 4 mm+50 ppm GA3 gave the best fruit length, diameter as compared to control treatment. Yield and fruit quality of the chosen trees were significantly increased by all treatments as compared to control in both seasons.

Enhancement of the Quality of Balady Mandarin (Citrus reticulate) Fruit Using L-Proline

“…Mandarin (Citrus reticulate) is considered as one of the important fruit crops in several countries, particularly Egypt (El-Mohamedy and Ahmed, 2009). The mandarin fruit is beautiful in shape as well as easy to exfoliate, which is also a good source of vitamins (C, A, and B), antioxidant compounds, and minerals (Yassin, 2021).…”