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Effects of Gibberellic Acid (ga3) on Physiological Contributing Characters of Mungbean (vigna Radiata L.)

Md. Manzurul Hoque
Graduate Student
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh, Bangladesh.

Md. Shahidul Haque
Assistant Professor
Department of Crop Botany, Bangladesh Agricultural University, Mymensingh, Bangladesh.

Abstract/ Executive Summary:

Two varieties of mungbean (Vigna radiata L.) were compared for effects of seed treatment and foliar application of GA₃ at 0, 50, 100 and 200 ppm on the growth contributing characters. Seed treatment with GA₃ at 50 ppm increased the leaf area index, total dry matter, crop growth rate, while 200 ppm increased relative growth rate and net assimilation rate. Foliar application of GA₃ at 200 ppm had higher relative growth rate, while that at 100 ppm had greater leaf area index, total dry matter, crop growth rate and net assimilation rate. Between the mungbean varieties, V₁ (BARI-4) performed better than V₂ (BARI-5) while the seeds were treated and an opposite result was found with foliar application of GA₃. Significant varietal differences were observed in terms of physiological characters. The study indicates a high potentiality to increase the yield of mungbean in Bangladesh by the application of GA₃.

Keywords: Mungbean, Vigna radiata L., Physiology, GA

Location: Field Laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh

Start Date: 00-10-2000

End Date: 00-02-2001

Program Area: Crop-Soil-Water Management

Non-commodity: Mungbean

Objectives:

To study the effect of GA₃ on physiological growth and development of mungbean.

Methodology:

The experiment was conducted at the Field Laboratory of the Department of Crop Botany, Bangladesh Agricultural University, Mymensingh during the period from October, 2000 to February, 2001. Two varieties of mungbean namely BARI moog-4 (V₁) and BARI moog-5 (V₂) collected from Bangladesh Agricultural Research Institute, Joydebpur, Gazipur were used in study. The land of the experimental site was first opened with a power tiller. After ploughing and laddering all the stubbles and uprooted weeds were removed to make the land ready for sowing and the basal dose of fertilizers was incorporated thoroughly before planting. The two factors experiment was laid out in Randomized Complete Block Design with 3 replications. The whole area was divided into 3 blocks and each block into 16 unit plots. The size of the unit plot was 2m²and the distance between plots was 0.5m. The plots were raised up to 15cm from the soil surface. The seeds of mungbean were sown in rows made by hand plough on October 24, 2000. The distances between rows and seeds were 30cm and 15cm, respectively and 2 seeds were placed in each point at 2-3cm depth. Seedlings were transferred to fill up the gaps where seeds failed to germinate. Irrigation was done as per necessity. The crop field was weeded twice: First weeding followed by thinning was done at 16 days after sowing (DAS) and second weeding was done at 45 DAS. Dimecrone 50 EC was sprayed @ 1 L/ha to prevent pod borer infestation as and when required. GA₃ solution was prepared two times first for seed treatment and second for spray. The first crop sampling was done on 15 days after sowing (DAS) and it was continued at an interval of 10 days till on 55 DAS. At the time of each harvest. five plants were selected randomly from each plot. The sampling was done until maturity. Physiological characters like- leaf area index, total dry matter, crop growth rate, relative growth rate and net assimilation rate were recorded. The data collected on different parameters under the experiment were statistically analyzed to obtain the level of significance using the MSTAT-computer package programme. The differences between pairs of means were compared by Duncan's Multiple Range Test (DMRT).

Source of Information: Pakistan Journal of Biological Sciences 5(4): 401-403, 2002

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results of the present study indicated that physiological parameters of mungbean can be favorably influenced by the application of GA₃ with a consequent yield increase. This result explined potential application of GA₃ for the increase of mungbean yield in Bangladesh.

Knowledge Management: Journal