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Assessment of Carbon Stock and Nutrient Contents in Soils of Northern and Eastern Piedmont Plains of Bangladesh

R. Islam
Dept. of Soil Science, Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur 1706, Bangladesh

L. Rahman
Soil Resource Development Institute, Dhaka 1215, Bangladesh

D. Islam
Dept. of Soil Science, Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur 1706, Bangladesh

A. Kashem
Sylhet Agricultural University, Sylhet, Bangladesh

A. Satter
Bangladesh Agricultural Research Council, Dhaka 1215, Bangladesh

S.M. Bokhtiar
SAARC Agriculture Centre, Dhaka 1215, Bangladesh

B. Hossain
Bangladesh Agricultural Research Council, Dhaka 1215, Bangladesh

M. Rahman
Dept. of Soil Science, Bangabandhu Sheikh Mujibur Rahman Agricultural University Gazipur 1706, Bangladesh

Abstract/ Executive Summary:

Under the changing climate documentation of soil carbon and nutrients is indispensable for sustainable crop production which is scarce in the agro-ecological zone (AEZ) of Northern and Eastern Piedmont Plains in Bangladesh. Therefore, the study was conducted collecting and analyzing a total of 240 soil samples considering 0-20 cm soil depth from two upazilas viz. Purbadhola and Akhaura under the mentioned AEZ to quantity carbon stock and nutrient contents of soils. Organic carbon stocks in soils of Purbadhola and Akhaura upazila were 45.97 and 97.04 Gg, respectively, while in the Northern and Eastern Piedmont Plains was 8.56 Tg. The soil pH was very strongly acidic to slightly acidic (4.4-5.8), organic carbon contents (0.53-1.31%) were very low to medium, while the overall soil fertility rated as very low to medium. Balanced fertilization using organic and inorganic sources in general and liming for upland crops might improve fertility and productive capacity of soils in the study area. The study opens up avenues to find out means and ways of increasing carbon contents in soils of Northern and Eastern Piedmont Plains and might help the policy makers to debate on future global carbon trading issues.

Keywords: Agro-ecological zones, Carbon contents, Land types.

Location: Two upazilas (Purbadhala and Akhaura) and three mouzas under each upazila of the agro-ecological zone Northern and Eastern Piedmont Plains (AEZ 22)

Start Date: 00-01-2011

End Date: 00-02-2011

Program Area: Crop-Soil-Water Management

Non-commodity: Carbon sequestration

Objectives:

The study was conducted to evaluate existing carbon stock and C, N, P and K contents of Northern and Eastern Piedmont Plains which might be helpful in improving soil health adopting different management practices at farmer’s level.

Methodology:

Study area The study was conducted in two upazilas (Purbadhala and Akhaura) and three mouzas under each upazila of the agro-ecological zone Northern and Eastern Piedmont Plains (AEZ 22).The selected mouzas were Naterkona, Khatoari and Meghshimul from Purbadhala, while Basudebpur, Noapara and Anandapur from Akhaura. Sampling protocol Soil samples were collected during January to February 2011 based on land types and soil depths. A total of 240 soil samples were collected from Purbadhala and Akhaura upazila of the AEZ 22 considering ten sampling spots per mouza, four samples per spot comprising 4 soil depths (0-5, 5-10, 10-15 and 15-20 cm). Samples collected were analyzed for organic carbon and other nutrients. Study parameters and methods of analysis of soil samples Soil bulk density was determined by core sampler method (Blake and Hartge, 1986). After calculating the soil bulk density collected soil samples were analyzed in the chemistry laboratory, Department of Soil Science, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh for organic carbon and other nutrients. Soil pH was determined by Glass Electrode pH Meter method with soil water ratio 1:2.5 (McLean, 1982), organic matter by Wet Oxidation method, total N by Kjeldhal systems (Bremner and Mulvaney, 1982), available P by Olsen’s method (Olsen and Sommers, 1982), and K by Ammonium acetate extraction method (Barker and Surh, 1982). Carbon stock calculation The carbon stock in soils of AEZ 22 was calculated using the equation 1, while the total carbon stock was calculated using equation 2. Carbon stock (t ha^-1) = carbon concentration (%) x bulk density (g cm-3) x depth (cm) ---- (1) Total carbon stock (t) = Carbon stock (t ha-1) x Area (ha) --------- (2) The area coverage of different land types of the AEZ were collected from fertilizer recommendation guide (BARC, 2012).

Source of Information: SAARC J. Agri., 16(2): 61-72 (2018)

Article Link (Online Journal): DOI: https://doi.org/10.3329/sja.v16i2.40258

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The organic carbon contents in 0-20 cm depth of high, medium high, medium low and low lands of Purbadhola were 25.40, 16.42, 18.81 and 28.44 t ha^-1, respectively, while in case of Akhaura these values were 23.56, 26.61, 24.80 and 30.00 t ha^-1, respectively. The total carbon stock in soils of Purbadhola, Akhaura upazila and in the AEZ were 45.97 Gg, 97.04 Gg, 8.56 Tg, respectively. The soil reaction was very strongly acidic to slightly acidic, organic carbon contents were very low to medium, nitrogen low, phosphorus very low and potassium low to medium. The soils of the Northern and Eastern Piedmont Plains was found slightly acidic to strongly acidic, organic carbon contents were very low to medium, nitrogen low, phosphorus very low and potassium low to medium. The study revealed that carbon stock and nutrient contents in soils of the Northern and Eastern Piedmont Plains were low, which should be increased adopting different soil and crop management practices best suited to the area concerned.

Knowledge Management: Journal