Effects of boric acid and zinc chelate spray and fruit bunch covering on some quantitative and qualitative traits of Piarom date palm fruit

Document Type : Original Article

Authors

1 Ph.D. Student, Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, University of Hormozgan, Bandar Abbas, Iran

2 Associate Professor, Department of Horticultural Sciences, Faculty of Agriculture and Natural Resources, University of Hormozgan, Bandar Abbas, Iran.

3 Assistant Professor, Plant Protection Research Department, Hormozgan Agricultural and Natural Resources Research and Education Center, Bandar Abbas, Iran.

4 Associate Professor, Soil and Water Research Department, Fars Agricultural and Natural Resources Research and Education Center, Shiraz, Iran.

10.30466/rip.2023.54332.1248

Abstract

Piarom is one of the most important date palm cultivars in Iran. It has gained a distinctive position in the domestic market compared with other cultivars, and its exports have been increasing. This study investigated the effects of spraying flower bunches with the micronutrients zinc and boron and covering fruit bunches on the quantitative and qualitative characteristics of Piarom dates. The experiment was conducted using a factorial arrangement in a randomized complete block design with three replicates. The first factor was foliar application, with five treatments: (1) boric acid at 2 g L⁻¹, (2) zinc chelate at 2 g L⁻¹, (3) a combination of boric acid and zinc chelate, each at 2 g L⁻¹, (4) distilled water, and (5) an untreated control. The second factor was fruit bunch covering, with two levels: no covering (control) and covering the fruit bunches with mesh at the khalal stage. Quantitative traits (fruit weight, length, and diameter), external quality (insect damage), and biochemical quality indices (pH, total soluble solids, antioxidant activity, and total sugar content) were evaluated. All foliar treatments improved the quantitative and qualitative fruit traits. Compared with the control, combined application of boric acid and zinc chelate, each at 2 g L⁻¹, increased total soluble solids by 6.22% and fruit antioxidant capacity by 7.7%. Covering the fruit bunches reduced insect damage by 96.47% compared with the control and increased total soluble solids by 2.15% and total antioxidant capacity by 14.72%. These findings support the use of boric acid and zinc chelate sprays, together with fruit bunch covering, to improve the quality of Piarom dates.

Keywords

References

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Research in Pomology
Volume 8, Issue 2
March 2024
Pages 180-190

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