Synergistic effects of spraying some growth regulators and antioxidants on growth and fruiting of tommy atkins mango trees growing in sandy soil

Abstract EN

In order to study the effect of spraying two growth regulators (Gibberellic acid “GA3” and Jasmonic acid “JA” each one at two concentration 15 ppm & 30 ppm) or/and two antioxidants (folic and citric acids each one at 500 ppm) on vegetative growth, fruit set and yield as well as fruit quality characteristics of mango trees cv.

Tommy Atkins, grown in sandy soil.

A field experiment was conducted during successive seasons of 2019 and 2020 at a private orchard located at Al-Wakf district, Qena Governorate.

The obtained results confirmed that spraying Tommy Atkins mango trees with GA3and JA each one at 15or 30 ppm as well as folic and citric acids each one at 500 ppm significantly enhanced trees vegetative growth.

Fruit set% , fruit retention% , yield (kg)/tree and its component as well as fruit quality properties (i.

e.

TSS% , total sugars % , vitamin C contents, total fiber% and total acidity % ) were significantly improved compared to untreated trees.

However the best vegetative growth traits i.

e.

shoot length, number of leaves/shoot and leaf area, leaves pigments, fruit set % , fruit retention % and yield weight (kg/tree) were obtained from the trees received GA3 at 30 ppm combined with citric acid at 500 ppm, followed by those received JA at 30 ppm combined with citric acid at 500 ppm.

While, spraying Tommy Atkins mango trees with JA at 30 ppm and citric acid at 500 ppm showed more effectiveness on fruit quality, followed by GA3 combined with citric acid at 500 ppm.