Effect of Bulb Diameter and Concentrations of Gibberellic Acid and Microelements on The Growth and Yield of Bulbs and Bulblets of Polianthes tuberosa L.
DOI:
https://doi.org/10.56286/ntujavs.v1i1.124Keywords:
Tuberose, Polianthes, GA3, bulb diameter, MicronutrientsAbstract
The experiment was carried out in the green net canopy of the Depart. of Hort. and Landscape Design at the College of Agric. and Forestry for the period from April 8 to December 30, 2020, on the tuberose plant Polianthes tuberosa L., cv. Single, to study the effect of three factors on the growth and bulbs and bulblets production, included first: three diameters of the bulbs: Large (24-31 mm), medium (17-23 mm) and small (9-16 mm), second: soaking with gibberellic acid (GA3) in concentrations: 0, 200 and 400 mg.l-1 for 24 hours before planting, and fertilizing with microelements at: 0, 0.75 and 1.50 g.l-1 with the fertilizer called IQ COMBI, sprayed on the vegetative growth twice, The factorial experiment was carried out using split plots in a randomized complete block design with three replicates and fifteen plants for treatment. The results indicated the following:
The use of large bulbs led to give the largest significant values of the number of leaves, number of lateral branches, leaf area, chlorophyll intensity, all the characteristics of the bulbs and the bulblets produced. The largest significant values were recorded in the characteristics of bulbs weight and circumference and bulblets weight and circumference when not treated with GA3. Spraying with micro-elements at a 0.75 g.l-1 had a significant effect in recording a significant increase in the characteristics, number of leaves, leaf area, chlorophyll intensity, bulb weight and volume, bulblet weight, diameter, circumference and volume. The results of the triple interaction between the factors under study indicated that the largest significant values were recorded when treating large bulbs with GA3 at 200 mg.l-1 and spraying with micro-elements at 0.75 g.l-1 for characteristics number of leaves 45.87 leaf.Pl-1, number of lateral branches 24.21 branch.pl-1, leaf area 63.13 cm2, chlorophyll intensity, weight of produced bulbs 52.77 g, diameter 43.63 mm, volume and number of bulblets.
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