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Efficacy Of Ga3 Primer And Foliar Spray Of Amino Acid (Tryptophan) On Growth Of Two Tulip Plant Cultivars (Tulipa Gesneriana L.)

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Document Type : Research Paper

Abstract

     The research was carried out in the lath house of Forestry Department / Agricultural Engineering Science College, University of Duhok, Duhok, Iraq, during the period from Oct., 25, 2024 to June, 1, 2025. The study aimed to investigate response of two tulip bulbs cultivars (Apeldoorn and Blushing Apeldoorn) to soaked in different gibberellic acid (GA3) primer concentrations including: (0, 200 and 400 mg L-1) for 24 hours and spray plants with amino acid (Tryptophan) at three concentrations (0, 150 and 300 mg L-1) in each 30 days till flowering. Three factors were used in the factorial Randomized Complete Block Design (RCBD) experiment. Each treatment will consist of 3 replicates and each replicate consisted of 6 pots with diameter 17 cm, The Duncan's Multiple Ranges Test was used to compare the means at a significance level of 5%. The results explained that Apeldoorn cv. was significantly superior to Blushing Apeldoorn cv. in the plant height (18.63 cm), bubllets number (3.26) and total carbohydrate content in leaves (6.25%), while Blushing Apeldoorn cv. was superior significantly in leave area (60.11 cm2), date to flower opening (148.38 days) and bulbs size (8.11 cm3). As for effect of gibberellic acid premier it noticed that the both concentrations of GA3 (200 and 400 mg L-1) appeared a significant effect on dry weight of leaves (1.91 and 1.93 g) and bulblets number (3.39 and 3.06) respectively than control, where GA3 at concentration (200 mg L-1) affect significantly on vase life of flowers (6.56 days), total chlorophyll content in leaves (69.39%) and total carbohydrates content in leaves (6.49%), on the other hand GA3 at concentration (400 mg L-1) had a significant impact on plant height (19.73 cm), and flowers stalk length (8.11 cm). Also spray of tryptophan significantly effect on some characteristics of tulip plant includes leaf area (61.72 cm2), bulblets number (3.50), total chlorophyll content (69.57%) and total carbohydrate content (6.40%) were affected significantly at 150 mg L-1 ,but dry weight of  leaves (2.03g), bulb size (8.15cm3) affected with 300 mg L-1.    

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References
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Kirkuk University Journal for Agricultural Sciences (KUJAS)
Volume 16, Issue 4 - Issue Serial Number 4
December 2025
Page 223-232
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