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Study on Rhizobium, Azotobacter and Phosphate Solubilizing Bacterial (psb) Population Status in Soils of Different Aezs of Bangladesh (2019–2020)

M.E. Ali
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

M.F.A. Anik
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

F. Alam
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

M. Rahman
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

S. Akhter
Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

Abstract/ Executive Summary:

Soil microbes play a major role in legumes to supply nutrients to plants as well as decomposition of organic materials and cycling of nutrients. Fourteen soil samples were collected from selected locations of different AEZs of Bangladesh to know the Rhizobium, Azotobacter and phosphate solubilizing bacterial population at different AEZs of Bangladesh. Soil samples were collected from BARI Central Farm, Gazipur (AEZ-28); BRRI, Habiganj (AEZ-23); Codda, Gazipur (AEZ-28); Saint Martin (AEZ-24); Godagari, Rajshahi (AEZ-26), Lebukhali, Patuakhali (AEZ-18); Batiaghata, Khulna (AEZ-13); OFRD, Gopalgonj (AEZ-19), OFRD, Narsingdi (AEZ-09), Badolgachi, Naogaon (AEZ-06), Gomostapuur, Chapainawabganj(AEZ-06), Akhaura, B. Baria (AEZ-30), Kasba, B. Baria (AEZ-30) and Shreemongal, Moulabibaza (AEZ-29). Rhizobium was grown in YMA media and Rhizobium colonies were counted. The highest Rhizobium (1.2 x 10⁶g^-1 soil) was found in soils of Godagari, Rajshahi (AEZ-26) and the lowest population (1.5 x 10²g^-1 soil) was observed in soils of Batiaghata, Khulna (AEZ-13). Azotobacter was grown in N-free media and Azotobacter colonies were counted. The highest Azotobacter population (7.0 x 10⁶g^-1 soil) was found in soils of Godagari, Rajshahi (AEZ-26) and the lowest population (3.5 x 10³g^-1 soil) was observed in BRRI, Hobigonj (AEZ-23). Phosphate solubilizing bacteria were grown in Pikovskaya’s media and PSB colonies were counted. The highest PSB population (8.5 x 10⁶g^-1 soil) was found in soils of Godagari, Rajshahi (AEZ-26) and the lowest population (1.5 x 10⁴g^-1 soil) was observed in Joydebpur (AEZ-28).

Keywords: Rhizobium, Azotobacter and Phosphate solubilizing bacteria; Nutrients

Location: Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

Start Date: 00-00-2019

End Date: 00-00-2020

Program Area: Crop-Soil-Water Management

Commodity: Bio fertilizer

Objectives:

The present study has been undertaken to know the Rhizobium, Azotobacter and phosphate solubilizing bacteria (PSB) population status in soils of different AEZs of Bangladesh.

Methodology:

Fourteen sites were selected considering 11 AEZs for collecting soil samples for Rhizobium, Azotobacter and PSB population viz. BARI Central Farm, Gazipur (AEZ-28); BRRI, Habiganj (AEZ-23); Codda, Gazipur (AEZ-28); Saint Martin (AEZ-24); Lebukhali, Patuakhali (AEZ-18); Batiaghata, Khulna (AEZ-13); OFRD, Gopalgonj (AEZ-19), OFRD, Narsingdi (AEZ 09), Badolgachi, Naogaon (AEZ-06), Gomostapuur, Chapainawabganj(AEZ-06), Akhaura, B. Baria (AEZ-30), Kasba, B. Baria (AEZ-30) and Shreemongal, Moulabibaza (AEZ-29). Land areas of these agro-ecological zones were recognized on the basis of hydrology, physiography, soil types, tidal activity, cropping patterns, and seasons. Representative soil samples have been collected from different crop fields of these agro-ecological zones. Soils were taken from three different places of each crop field from 0-6 inches depth and then the soils were placed in plastic bags. The plastic bags were pin holed for aeration and stored in the laboratory prior to analysis. Media was prepared for the growth of Rhizobium, Azotobacter and PSB colonies. After serial dilution, one ml of solution was poured in a petridish having three different types media. The petriplates were incubated for three days for counting Rhizobium, Azotobacter and PSB colonies.

Source of Information: Annual Research Report 2019–2020, Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Microbial population in soil was found in different numbers in different locations. It was observed that the highest Rhizobium population (1.2 x 10⁶g^-1 soil) was found in soils of Godagari, Rajshahi (AEZ-26) and the lowest population (1.5 x 10²g^-1 soil) was observed in soils of Batiaghata, Khulna (AEZ-13). The highest Azotobacter population (7.0 x 10⁶g^-1 soil) was found in soils of Godagari, Rajshahi (AEZ-26) and the lowest population (3.5 x 10³g^-1 soil) was observed in BRRI, Hobigonj (AEZ-23). The highest PSB population (8.5 x 10⁶g^-1 soil) was also found in soils of Godagari, Rajshahi (AEZ-26) and the lowest population (1.5 x 10⁴g^-1 soil) was observed in BARI central farm, Gazipur (AEZ-28). Further studies in soils of different AEZs of Bangladesh are needed to verify the Rhizobium, Azotobacter and PSB population.

Knowledge Management: Report/Proceedings