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Effects of Different Bradyrhizobium Strains and Urea-n on the Growth and Yield of Soybean

M.K. Hasan
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M.M. Rahman
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M.R. Islam
Department of Soil Science, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

A pot experiment was conducted in the net-house of the Department of Soil Science, Bangladesh Agricultural University, Mymensingh during January to May, 2007 to investigate the effects of six selected Bradyrhizobium strains and urea-N on the growth and yield of soybean. There were eight treatments such as To: control, T1: Urea @ 40 kg N had, T2: BAU 101, T3: BAU 107, T4: BAU 118, T5: BAU 145, T6: BAU 150 and T7: TAL 102. The experiment was laid out in a Completely Randomized Design (CRD) having four replications. Phosphorus, potassium and sulphur were applied as basal dose from TSP, MOP and gypsum @ 40 kg P ha-1, 60 kg K ha-1 and 15 kg S had, respectively. Bradyrhizobium inoculation significantly increased the nodule number, nodule dry weight, root weight, shoot weight, N content and N uptake by plant at 33, 60 and 98 days after sowing over uninoculated control. Bradyrhizobium inoculation also significantly increased pod and seed number per plant, 100- seed weight, grain and stover yield of soybean over control. The effects of the strain BAU 107 was found most promising in growing soybean crop.

Keywords: Bradyrhizobium, Nitrogen, Soybean

Location: Department of Soil Science, Bangladesh Agricultural University, Mymensingh

Start Date: 00-01-2007

End Date: 00-05-2007

Program Area: Crop-Soil-Water Management

Commodity: Soybean, Nitrogen, Dhaincha

Objectives:

Thus, the selection of more effective Bradyrhizobium strains is one of the most important means for obtaining higher soybean yields. With the view in mind, a piece of research work was conducted to evaluate the effects of six selected Bradyrhizobium strains and urea-N on nodulation, growth and yield of soybean and to investigate the effect of bradyrhizobial inoculants and urea-N on nitrogen content and uptake by soybean plants.

Methodology:

A pot experiment was conducted in a net house adjacent to the Department of Soil Science, Bangladesh Agricultural University, Mymensingh during January to May, 2007 to evaluate the effects of six selected Bradyrhizobium strains and urea-N on the growth and yield of soybean. The experiment was laid out in a Completely Randomized Design (CRD) having four replications. There were eight treatments such as To: control, T1: Urea @ 40 kg N ha-1, T2: BAU 101, T3: BAU 107, T4: BAU 118, T5: BAU 145, T6: BAU 150 and T7: TAL 102. The inoculants included five local and one exotic strains of Bradyrhizobium. Soil was collected from Boyra village near BAU campus, Mymensingh at a depth of 0-15 cm. A composite soil sample was dried, ground, sieved and stored in plastic containers and then analyzed for physicochemical properties following standard methods (Page et al., 1989). The soil was silty loam in texture having pH 5.9, organic matter 1.92%, total N 0.09%, available P 8.12 ppm, exchangeable K 0.13 me/100 g soil, available S 11.26 ppm and CEC 13.1 me/100 g soil. Each pot was filled with 10 kg soil for sowing the seeds. Phosphorus @ 40 kg P ha-1 from triple super phosphate (TSP), potassium @ 60 kg K ha-1 from muriate of potash (MOP) and sulphur @ 15 kg S ha-1 from gypsum were applied as basal dose. Urea @ 40 kg N ha-1 was applied in T1. Half dose of urea was applied during the final soil preparation and the other half was applied in 2 equal splits at 20 and 50 days after sowing. The plant parameters such as number of nodule per plant, nodule dry weight, shoot and root weight Data were recorded at 33, 60 and 98 days after sowing (DAS). The number of pods per plant, number of seeds per plant, seed and stover yield was also recorded. The N content and uptake, and the protein content of soybean seed were estimated. The data were analyzed statistically and the mean differences were adjudged by Duncan's Multiple Range Test (DMRT).

Source of Information: J. Bangladesh Agril. Univ. 5(2): 257-262, 2007 ISSN 1810-3030

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Achievement/Findings:

The overall results of the pot experiment indicate that inoculation of soybean seeds with Bradyrhizobium strains exerted a beneficial effects on nodulation, dry matter production, number of pods plant-1, 100-seed weight, grain and stover yield, N content and uptake by soybean plant. The effects of most of the Bradyrhizobium strains were promising in growing soybean crops. Considering all the parameters studied, the performance of the inoculants was better as compared to urea-N @ 40 kg N ha-1. Among the Bradyrhizobium strains, BAU 107 showed the best performance. However, further field experimentation is needed for the final recommendation of the strain for soybean cultivation in Bangladesh.

Knowledge Management: Journal