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Studies on the Effects of Bradyrhizobium Inoculation on Yield and Yield Attributes of Mungbean

M.A.H. BHUIYAN
Senior Scientific Officer
Soil Microbiology Laboratory, BARI, Gazipur-1701,

M.H. MIAN
Vice-Chancellor
Bangladesh Agricultural University, Mymensingh,

M.S. ISLAM
Former Director General
BARI, Gazipur-1701, Bangladesh.

Abstract/ Executive Summary:

Field studies with and without Bradyrhizobium was carried out with five mungbean varieties to observe the yield and yield attributes of mungbean. Five mungbean varieties viz. BARI Mung-2, BARI Mung-4, BARI Mung-5, BINA mung-2 and Barisal local, and the rhizobial inoculum (Bradyrhizobium strain BAUR-604) were used. The seeds and stover were dried and weighed adjusting at 14% moisture content and yields were converted to t/ha. The yield attributing data were recorded from 10 randomly selected plants. BARI Mung-2 produced the highest 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). Higher number of pods/plant was also recorded in BARI Mung-2, while BARI Mung-5 produced the highest 1000-seed weight. Application of Bradyrhizobium inoculant produced significant effect on 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. Bradyrhizobium inoculation also significantly increased pods/plant, seeds/pod and 1000-seed weight. Inoculated BARI Mung-2 produced the highest seed and stover yields as well as yield attributes, such as pods/plant and seeds/pod.

Keywords: Bradyrhizobium, Inoculation, Yield, Yield attributes, Mungbean.

Location: Bangladesh Agricultural University Farm, Mymensingh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Mungbean, Bio fertilizer

Objectives:

To determine the effect of seed inoculation with Bradyrhizobium on mungbean and to select a suitable variety on the basis of dry matter production, seed yield and yield attributes for inclusion into cereal based (wheat-rice-rice) cropping pattern during kharif-I season in agroecological zone 9 of Bangladesh.

Methodology:

The investigations to determine the effect of seed inoculation with Bradyrhizohium on the production efficiency of different mungbean vrieties were carried out at the Bangladesh Agricultural University Farm, Mymensingh. A field experiment was laid out in randomized complete block design in four replications with a net plot size measuring 4m x 5m on a soil containing 0.10% N, 10.0 μg g^-1 available phosphorus, 0.12 meq 100 g^-1 exchangeable potash, 14.0 μg g^-1 available sulphur, 1.37 μg g^-1 available zinc and 0.23 μg g^-1 available boron in 2001 and 0.10% N, 9.7 μg g^-1 available phosphorus, 0.13 meq 100 g^-1 exchangeable potash, 13.0 μg available sulphur, 1.45 μg g^-1 available zinc and 0.20 μg g^-1 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 rows. All the fertilizers were broadcast at sowing in the form of triple superphosphate, muriate of potash, gypsum, zinc sulphate, and boric acid. Rhizobium strain BAUR 604 (Rhizobium spp.) was obtained from Dept. 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 method. The average number of bradyrhizobia was approximately above 10⁸ cells g^-1 in the inoculant. The mungbean seeds were coated with gum acacia. After that, inoculum was mixed with gum acacia coated mungbean seeds and the seeds were shade dried. Ten plants were selected randomly at maturity from each plot for recording pods/plant, seeds/pod and 1000-seed weight, whereas yield was recorded on net plot basis. 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 means.

Source of Information: Bangladesh J. Agril. Res. 33(3) : 449-457, September 2008, ISSN-0258-7122

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Study, it was observed that the seed yield of the tested mungbean ranged between 0.5 and 1.0 t/ha, which was quite reasonable yield in the tropical climate while the stover yield ranged from 1.69 to 2.31 t/ha. The effect of inoculation on the seed and stover yields was also observed. Bradyrhizobium inoculation significantly increased seed and stover yield of mungbean. But varietal response to inoculation was insignificant. BARI Mung-2 had the highest yield. The variety BARI Mung-2 may be recommended for cultivation with or without Bradyrhizobium inoculation.

Knowledge Management: Journal