Evaluating the Morphological Characteristics of Narcissus tazetta L. under Different Gibberellin Acid Spray and soil application of limestone powder

Mohammed, Layla Shaaban; Abdullah, Payman Aziz; Sulaiman, Rojan Shawkat

doi:10.36531/ijds.2026.191979

	Evaluating the Morphological Characteristics of Narcissus tazetta L. under Different Gibberellin Acid Spray and soil application of limestone powder
IRAQI JOURNAL OF DESERT STUDIES
Volume 16, Issue 1 - Serial Number 16, July 2026, Pages 1-15 PDF (1.27 M)
Document Type: Research Paper
DOI: 10.36531/ijds.2026.191979
Authors
Layla Shaaban Mohammed^* ¹; Payman Aziz Abdullah²; Rojan Shawkat Sulaiman²
¹Department of Horticulture, Agriculture Engineering Sciences College, University of Duhok Duhok, Kurdistan Region, Iraq
²Department of Horticulture, Agriculture Engineering Sciences College, University of Duhok Duhok
Abstract
The effect of geographic origin (L1–L5), gibberellic acid (GA₃: 0, 75, 150 mg·L⁻¹), and limestone powder (CaCO₃: 0, 2, 4 g·pot⁻¹) on growth and flowering characteristics of narcissus was evaluated. Location L1 gave consistently superior results for all vegetative growth characteristics. The highest rate of GA₃ and CaCO₃ significantly influenced all characteristics compared to controls. The triple interaction was also highly significant. The optimal combination of location × 150 mg·L⁻¹ GA₃ × 4 g·pot⁻¹ CaCO₃ gave maximum value for leaf number (14.641), leaf length (37.164 cm), leaf dry weight (6.056 g), flower number (6.482), root number (43.918), and root dry weight (2.111 g) in comparison with other treatments. Stalk length and stalk diameter were maximized in location L1 with high rates of GA₃ and CaCO₃: 35.260 cm and 3.776 mm, respectively. However, bulb weight reached its peak (66.300 g) in L5 under the same chemical treatments, while the largest bulb diameter (4.990 cm) was recorded in L3 with 4 g·pot⁻¹ CaCO₃. The results demonstrate that the synergistic application of GA₃ and limestone soil amendment, particularly with bulbs from favourable locations (especially L1), significantly maximizes the growth, flowering, and bulb quality of narcissus. .
Keywords
Narcissus tazetta; Gibberellic acid; Limestone powder; Soil amendment

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