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Effect of Spraying Frequency of Gibberellic Acid on Growth and Flowering in Gerbera

H. Mehraj
Department of Horticulture, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

T. Taufique
Department of Horticulture, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

A. F. Ona
Department of Horticulture, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

M. Z. K. Roni
Dept. of Horticulture, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh

A.F.M. Jamal Uddin
Department of Horticulture, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted at Department of Horticulture, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh to evaluate the effect of gibberellic acid (150-ppm GA₃, G) on gerbera. Four treatments, namely G₀; no spray of GA₃ (Control), G₁; one time spray of GA₃ at 15 days after transplanting (DAT), G₂: two times sprays of GA₃ (at 15 and 30 DAT) and G3: three times sprays of GA₃ (at 15, 30 and 45 DAT) were used in the present study. It was observed that G₃ performed as the best treatment in terms of having significantly higher number of leaves plant^-1 (58.7), plant height (50.5 cm), individual leaf area (35.8 cm²), chlorophyll content, number of flower plant^-1(16.3), peduncle length (36.1 cm), peduncle diameter (3.1 mm) and flower head diameter (7.4 cm). G₃ also took the maximum days for the first flower bud initiation (83.8 days) while G₀ took the minimum days (65.7 days). So, it was interpreted that three times spraying of GA₃ caused delay in flowering ensuring proper vegetative growth for producing maximum flower production.

Keywords: Gerbera, Spray of GA3, Growth, Flowering

Location: Horticultural Farm, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh

Start Date: 00-12-2012

End Date: 00-05-2013

Program Area: Crop-Soil-Water Management

Commodity: Gerbera

Objectives:

Objective of the study was to evaluate the effect of gibberellic acid (150-ppm GA₃, G) on gerbera.

Methodology:

An experiment was carried out at the Horticulture Farm, Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from December 2012 to May 2013 in a complete randomized design with five replications. Soil and cow-dung (1:1) were mixed and pots (10 inches) were filled 10 days before transplanting. Recommended chemical fertilizers (5, 10 and 5 g of N, P and K respectively in each pot) were mixed with the soil. Brick red colored gerbera cultivar was exerted on the experiment. GA₃ was sprayed with the same concentration (150 ppm) according to treatment. Sprayings of gibberellic acid @150-ppm were done with the following treatments, namely G₀; no spray of GA₃ (Control), G₁; one time spray of GA₃ at 15 days after transplanting (DAT), G₂: two times sprays of GA₃ (at 15 and 30 DAT) and G₃: three times sprays of GA₃ (at 15, 30 and 45 DAT) were used in the present study. Data were collected on number of leaves, plant height, leaf area, chlorophyll (i.e. SPAD value) and days to first flower bud initiation, number of flower, peduncle length, peduncle diameter and flower head diameter. Number of leaves and plant height were measured at 30 days interval starting from 30 DAT and continued up to 150 DAT. Leaf area, chlorophyll content (SPAD value) and peduncle diameter were measured by using CL-202 Leaf Area Meter, SPAD-502 Chlorophyll Meter and Digital Caliper-515 (DC-515) respectively. Leaf area and chlorophyll content were measured at 120 DAT and peduncle diameter at full bloomed stage. All parameters were statistically analyzed by using MSTAT-C computer package program. Mean for all the treatments was calculated, analysis of variance for each of the characters performed by F-test and difference between treatments evaluated by Least Significant Difference test at 5% level of significance

Source of Information: J. Expt. Biosci. 4(2):7-10, (2013)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Three times spraying of 150 ppm GA₃ at 15, 30 and 45 DAT could increase plant growth, flower production and flower quality of gerbera.

Knowledge Management: Journal