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Assessment of Microbial Biomass Carbon and Nitrogen in Some Tea Soils of Bangladesh

SM Abdur Rahman and ARM Solaiman
Department of Soil Science, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur 1706, Bangladesh.

SM Abdur Rahman and ARM Solaiman
Department of Soil Science, Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur 1706, Bangladesh.

Abstract/ Executive Summary:

Microbial biomass carbon (C) and nitrogen (N) and their contribution to soil organic carbon and total N contents were assessed in soils collected from Bilashchara Tea Estate under Bangladesh Tea Research Institute (BTRI), Srimangal of Moulavibazar district, and Sripur Tea Garden under Jaintapur of Sylhet district. Microbial biomass C and N in Bila shchara Tea Estate soils varied from 90.4-144.0 and 20.5-29.0 mg/kg soil, and that of Sripur Tea Garden soils varied from 120.7-362.0 and 26.6-59.5 mg/kg soil, respectively. Within the two tea growing areas biomass C/N ratios ranged from 3.35-6.12. Relationships between biomass C and organic carbon and biomass N and total N were positively correlated. The contribution of biomass C to soil organic C was 1.23%, ranging from 0.9-1.55% and the contribution of biomass N to total N content of the soils ranged from 1.19-2.89%.

Keywords: Biomass carbon (C), Biomass nitrogen (N), Organic C, Total N,Tea soil

Location: BTRI,Srimangal, Moulavibazar

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To estimate the microbial biomass C and N and their contribution to soil organic carbon and total nitrogen contents of some selected tea soils of Bangladesh

Methodology:

Collection of soil samples and their initial properties: Soils of Bilashchara Tea Estate under Bangladesh Tea Research Institute (BTRI), Srimangal, Moulavibazar district and that of Sripur Tea Garden under Jaintapur upazila, Sylhet district used in this experiment belong to Low Hills and Piedmont Plains (agroecological zone, AEZ 29). Soil samples were collected during winter season. Three sections from Bilashchara Tea Estate and one section from Sripur Tea Garden were chosen for sample collection. Each section consisted of ‘tillah’. From each section soil samples were collected from top, middle and bottom of the tillah. The depth of the collected soil samples was between 0-9 inches. In total 12 soil samples were collected from four tillah/sections. Each soil sample was a composite of three soil samples. The bulk soil samples were air-dried, crushed and passed through two mm sieve and analyzed for characterization. All undesirable materials like roots, insects, stones and discrete pieces of organic matter were cleaned.

Source of Information: Bangladesh J Microbiol, Volume 25, Number 1, June 2008, pp 21-25

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Microbial biomass C and N in Bila shchara Tea Estate soils varied from 90.4-144.0 and 20.5-29.0 mg/kg soil, and that of Sripur Tea Garden soils varied from 120.7-362.0 and 26.6-59.5 mg/kg soil, respectively. Within the two tea growing areas biomass C/N ratios ranged from 3.35-6.12. Relationships between biomass C and organic carbon and biomass N and total N were positively correlated. The contribution of biomass C to soil organic C was 1.23%, ranging from 0.9-1.55% and the contribution of biomass N to total N content of the soils ranged from 1.19-2.89%.

Knowledge Management: Journal