Effects of Urea, Zinc Sulfate, and Gibberellic Acid Applied via Trunk Injection on Productivity and Fruit Quality of 'Barhi' Date Palm.

The purpose of this study was to examine the effects of urea, gibberellic acid (GA3), and zinc
sulfate (ZnSO4) on the production and quality of 'Barhi' date palm at a private orchard in Wadi
Natron, Egypt, over the course of seasons (2021 and 2022). Twenty-year-old 'Barhi' cultivar.
Palms were chosen for this study. Under drip irrigation, the planting distances were 8 by 8
meters. Treatments were applied via manual trunk injection one meter above the ground. Three
replicates were used in the fully randomized block design experiment. The treatments included a
control, several concentrations of GA3 (500, 1000, and 2000 mg/l), and various combinations of
urea and ZnSO4 with GA3. According to the results, the highest mean values for all physical
fruit attributes (fruit length, diameter, size, and weight) were recorded by the combined treatment
of 1 kg urea + 6 g ZnSO4 + 2000 mg/l GA3. The 1 kg Urea + 1000 mg/l GA3 came next, both of
which greatly outperformed the control treatments, which had the lowest mean values for these
characteristics. Additionally, when compared to the control treatment, which displayed lower
values for these advantageous traits while simultaneously recording higher values of total acidity
and tannins, the combined treatment of 1 kg urea + 6 g ZnSO4 + 2000 mg/l GA3 also recorded
the highest mean values for all chemical fruit characteristics, including total sugars, reducing
sugars, non-reducing sugars, TSS, vitamin C, and minerals
Date palm (Phoenix dactylifera L.), urea, GA3, ZnSO4, yield, chemical composition