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Effect of Bradyrhizobium Inoculation on Nodulation, Biomass Production and Yield of Mungbean

M Asadul Haque Bhuiyan
Senior Scientific Officer, Soil Science Division, Bangladesh Agricultural Research Institute (BARI), Gazipur 1701, Bangladesh.

Mosharraf Hossain Mian
Bangladesh Agricultural University (BAU), Mymensingh 2202, Bangladesh.

Abstract/ Executive Summary:

Experiments with or without Bradyrhizobium was carried out with five mungbean varieties at Bangladesh Agricultural University Farm during kharif-I 2001 and kharif-I 2002 seasons to observe nodulation, biomass production and yield of mungbean. Significant influences of the mungbean varieties were observed on nodulation, biomass production and yield. BARI Mung-2 produced the highest nodule number, nodule weight, shoot weight, seed yield (1.03 t/ha in 2001 and 0.78 t/ha in 2002) and stover yield (2.24 t/ha in 2001 and 2.01 t/ha in 2002). Application of Bradyrhizobium inoculant produced significant effect on nodulation, shoot dry weight, seed and stover yields in both trials conducted in two consecutive years. Seed inoculation significantly increased seed (0.98 t/ha in 2001, 27% increase over control and 0.75 t/ha in 2002, 29% increase over control) and stover (2.31 t/ha in 2001 and 2.04 t/ha in 2002) yields of mungbean. Inoculated BARI Mung-2 produced the highest nodulation, dry matter production, seed and stover yields. Considering nodulation, biomass production and seed and yields, BARI Mung-2 was found as the best variety among the five. BARI Mung-5 produced the second highest seed yield followed by BARI Mung-4 and BINA Mung-2, and the lowest seed yield was observed in Barisal local.

Keywords: Mungbean, Nodulation, Bradyrhizobium

Location: BAU, Mymensingh

Start Date: 00-00-2001

End Date: 00-00-2002

Program Area: Crop-Soil-Water Management

Commodity: Mungbean

Objectives:

1.To determine the effect of seed inoculation with Bradyrhizobium on mungbean.

2.To select a suitable variety on the basis of nodulation, biomass production and seed yield in agro-ecological zone (AEZ) region 9 under Old Brahmaputra Floodplain of Bangladesh

Methodology:

The investigations to determine the effect of seed inoculation on nodulation, biomass production and yield of different mungbean varieties were carried out at the Bangladesh Agricultural University Farm, Mymensingh. A field experiment was laid out in randomized complete black design (RCBD), in four replications with a net plot size measuring 5 m x 4 m on a soil containing 0.10% N, 10.0 μg/g available phosphorus, 0.12 meq/100 g exchangeable potash, 14.0 μg/g available sulphur, 1.37 μg/g available Zn and 0.23 μg/g available boron in 2001 and 0.10% N, 9.7 μg/g available phosphorus, 0.13 meq/100 g exchangeable potash, 13.0 μg/g available sulphur, 1.45 μg/g available Zn and 0.20 μg/g available boron in 2002. The experiment comprised of seed inoculation with Bradyrhizobium and control (without seed inoculation. Five mungbean varieties, viz., BARI Mung-2, BARI Mung-4, BARI Mung-5, BINA Mung-2 and Barisal local were planted using a seed rate of 35 kg/ha in 30 apart now. All the fertilizers were broadcast at sowing in the form of triple superphosphate, marinate of potash, gypsum, zinc sulphate and boric acid. Rhizobium strain BAUR 604 (Rhizobium spp.) was obtained from Department of Soil Science, Bangladesh Agricultural University, Mymensingh and peat based inoculant was used in this experiment. Viability count of bradyrhizobia in the inoculant was made one day before injecting the peat following plate count method7. The average number of bradyrhizobia was approximately above 108 cells/g in the inoculant. The mungbean seeds were coated with gum acacia. After that, inoculum was mixed with gum acacia coated mungbean seeds and dried up under shade.The crop was sown on 15 March 2001 and 21 March 2002, respectively. Inoculated seeds of mungbean @ 35 kg/ha were sown by hand as uniformly as possible in furrows. Different polyethylene bags were used for different treatments and theuninoculated seeds were sown first to avoid the risk of contamination. Seeds were sown in the afternoon and immediately covered with soil to avoid sunlight. Line to line distance was 30 cm. Weeding, thinning was done to maintain optimum plant density. Plant to plant distance was maintained at 7.5 cm. Ten plants from each plot were selected randomly and nodules were counted at 42 days after sowing (DAS). The crop was harvested at full maturity and dry weight of seed and stover was recorded from an area of 4 m x 3 m of each plot. The seeds and stover were dried and weighed adjusting at 14% moisture content and yields were converted to t/ha. The data collected were analyzed by using analysis of variance techniques and Duncan’s New Multiple Range Test was applied to test the significance of treatment means⁸

Source of Information: Bangladesh J Microbiol, Volume 24, Number 2, December 2007, pp 95-99

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Significant influences of the mungbean varieties were observed on nodulation, biomass production and yield. BARI Mung-2 produced the highest nodule number, nodule weight, shoot weight, seed yield (1.03 t/ha in 2001 and 0.78 t/ha in 2002) and stover yield (2.24 t/ha in 2001 and 2.01 t/ha in 2002). Application of Bradyrhizobium inoculant produced significant effect on nodulation, shoot dry weight, seed and stover yields in both trials conducted in two consecutive years. Seed inoculation significantly increased seed (0.98 t/ha in 2001, 27% increase over control and 0.75 t/ha in 2002, 29% increase over control) and stover (2.31 t/ha in 2001 and 2.04 t/ha in 2002) yields of mungbean. Inoculated BARI Mung-2 produced the highest nodulation, dry matter production, seed and stover yields. Considering nodulation, biomass production and seed and yields, BARI Mung-2 was found as the best variety among the five. BARI Mung-5 produced the second highest seed yield followed by BARI Mung-4 and BINA Mung-2, and the lowest seed yield was observed in Barisal local.

Knowledge Management: Journal