IMPACT OF GIBBERELLIC ACID AND BORON TRIOXIDE NANOPARTICLES FOLIAR SPRAYING ON GROWTH, YIELD AND FRUIT QUALITY OF "ZAGHINIA" APRICOT TREES
A. M. I. Al-Janabi
To determine the extent of growth response and yield of apricot trees cv. Zaghinia to foliar spraying with gibberellic acid at 0, 25, 50, and 75 mg L-1 and boron trioxide nanoparticles at 0, 10, and 20 mg L-1. A field trial was executed in a private orchard, in the governorate of Anbar, Iraq, during the growing season of 2023, in which trees were sprayed a week after full bloom, followed by two sprays at a three-week interval. A factorial experiment (4 x 3) on 36 trees, 7 years old was performed using a Randomized Complete Block Design (RCBD). With three replications and one tree for the experimental unit. Among all the treatments applied, (GA3 at 75 mg L-1 + Nano-boron at 20 mg L-1) treatment performed the highest annual shoot length (46.51 cm), chlorophyll content (41.04 mg 100 g-1 fresh weight), fruit set (53.86%), fruit retention (41.69%), fruit yield (14.43 kg tree-1), fruit weight (25.59 g), fruit volume (32.84 cm3), total soluble solids (15.12%) and carotene content (0.270 mg 100 g-1). While the treatment (GA3 at 25 mg L-1 + Nano-boron at 20 mg L-1) gave the highest shoot diameter (5.06 mm), and lowest acidity (0.81%). On the other hand, the control treatment recorded the lowest values, amounting to (26.61 cm, 4.91 mm, 34.11 mg 100 g-1 fresh weight, 39.27%, 30.19%, 8.56 kg tree-1, 17.92 g, 25.81 cm3, 13.53%, and 0.106 mg 100 g-1) for the traits length and diameter of annual shoots, chlorophyll content, fruit set and retention, total yield, fruit weight and volume, TSS, and carotene content respectively
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