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Effects of Tiba on Growth, Yield and Yield Components of Soybean

NARGIS JAHAN
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

SALMA KHAN
Department of Botany, University of Dhaka, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

Effects of 20, 50, 100 and 150 ppm TIBA on growth and yield of BARI soybean -5 were evaluated. Plant height reduced significantly due to 50, 100 and 150 ppm TIBA. There was an increasing tendency in number of leaves per plant with increase in the concentrations of TIBA. Number of leaves and dry weight of shoot significantly increased following TIBA applications. Yield components viz. number of branches per plant, number of pods per plant, fresh weight and dry weight of pods per plant, 100 seed weight and seed yield per plant increased significantly due to 100 and 150 ppm TIBA application, whereas, most of the yield parameters decreased due to 20 ppm TIBA. Yield per plant increased by 7.32, 18.81 and 21.50% following 50, 100 and 150 ppm TIBA. Pigment content of leaf was not affected significantly due to TIBA application. Amongst all the concentrations 150 ppm TIBA produced best stimulation.

Keywords: Soybean, TIBA, Growth, Yield components, Yield

Location: Department of Botany, University of Dhaka

Start Date: 00-12-2010

End Date: 00-04-2011

Program Area: Crop-Soil-Water Management

Commodity: Soybean

Objectives:

1. The present investigation was undertaken to study the effect of TIBA on growth and yield of BARI soybean-5 grown in Bangladesh.

Methodology:

The field experiment was conducted in the research field of the Department of Botany, University of Dhaka during the rabi season from December 2010 to April 2011. The experiment was laid out using Randomized Block Design (RBD) with factorial arrangement with three replications. The nature of the field soil was clay loam. The soil of the field was thoroughly tilled, and left for 7 days for sun drying. Cow dung at the rate of 20 ton per hectare and Urea, Triple super phosphate (TSP), Muriate of Potash (MP), Gypsum and Boron at the rate of 60, 175, 120, 115 and 10 kg per hectare respectively, were applied at the time of final land preparation. Seeds of BARI soybean-5 were obtained from Oilseeds research center of Bangladesh Agricultural Research Institute, Joydebpur, Gazipur. Seeds of uniform size were surface sterilized with 0.5% Calcium hypochlorite and then commercially available Rhizobium inoculum for soybean at the rate of 15g per kg of seeds were added to small amount of molasses and seeds and stirred until the seed coats were covered with inoculum. The seeds were sown on 23rd December, 2010 directly in the field in rows 15 cm apart. The first and second thinning were done at the age of 10 and 17 days respectively after emergence (DAE). Thinning was made in such as a way that healthy seedlings of uniform size and vigour were allowed to grow in each row and also to maintain the plant to plant distance at 10 cm. Regular watering and weeding were done as required. The experiment consisted of five treatments: T₀ = control, T₁ = 20 ppm TIBA, T₂ = 50 ppm TIBA, T₃ = 100 ppm TIBA and T₄= 150 ppm TIBA. Single foliar spray treatments of TIBA were applied on 40 DAE of plants. Plant height, number of leaves per plant, fresh weight and dry weight of shoot, were recorded at an interval of 15 days starting from the age of 15 days after spray (DAS) up to harvest (75 DAS). During harvest 5 randomly selected plants from each replication were uprooted. Number of branches per plant, number of pods per plant, fresh weight of pods per plant, dry weight of pods per plant, number of seeds per pod, weight of 100 seeds and seed yield per plant were recorded after harvest. Chlorophyll pigments were determined at the age of 25, 40 and 55 DAS according to specific absorption co-efficient method. The amounts of carotenoids were determined by the equation of Von Wettstein. Data were analyzed statistically and least significance difference (LSD) test was applied for the comparison of various means at 5% level of significance.

Source of Information: J. Asiat. Soc. Bangladesh, Sci. 40(1): 89-96, June 2014

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The yield potential of green plants is related to its chlorophyll content and also to the dry matter content of the plant. Hence, increase in yield of the soybean var. BARI soybean- 5 may possibly be due to the enhancement of chlorophyll content and dry matter production. Therefore, from the above discussion, it is evident that higher doses (150 ppm) of TIBA produced better stimulations on BARI soybean-5. With the increase in concentration of TIBA plant height was reduced, whereas, number of leaves per plant and number of branches per plant increased. Number of pods per plant, number of seeds per pod and 100 seed weight also increased with the increasing concentrations, thus leading to higher seed yield per plant, the maximum being due to 150 ppm TIBA treatment.

Knowledge Management: Journal