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Effects of Cropping Pattern on Carbon Sequestration and Aggregate Stability of Soil in Long Term Agricultural Fields in Khulna, Bangladesh

MD TAREQ BIN SALAM*
Soil, Water and Environment Discipline, Khulna University, Khulna-9208, Bangladesh

MD TIPU SULTAN
Soil, Water and Environment Discipline, Khulna University, Khulna-9208, Bangladesh

MEHJABIN HOSSAIN
Soil, Water and Environment Discipline, Khulna University, Khulna-9208, Bangladesh

MUST ALIMA RAHMAN
Agricultural Chemistry Department, Sher-e-Bangla Agricultural University, Dhaka-1207, Bangladesh

Abstract/ Executive Summary:

Effects of cropping pattern on soil carbon sequestration and their aggregate stability in long term agricultural fields was investigated in 2018. Four cropping patterns were selected that have been cultivated for last ten years. Results showed that Soil organic carbon (SOC) value was improved for vegetable field from 4.06 to 9.11 g/kg and carbon stock (20.14 Mg C ha/yr) as well as soil carbon sequestration rate was the highest in vegetable field (1.12 Mg C ha/yr). The logarithmic relationship between the C input and C sequestration rate showed the strong correlation (r = 0.72, p < 0.05). In terms of aggregate stability, vegetable field put the best result (0.41 mm) (p > 0.05). The straight-line relation between aggregate stability and Cstock established that they are strongly correlated (r = 0.81, p < 0.05). Finally, results indicated that Vegetable-Vegetable-Vegetable cropping pattern was the best soil carbon sequester along with the best aggregate stability.

Keywords: Soil carbon sequestration, Soil organic carbon, Aggregate stability, Carbon input, Carbon stock

Location: 3 different villages of Dumuria Upazila (sub-district), Khulna, Bangladesh

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Cropping pattern, Carbon sequestration, Soil aggregate

Objectives:

The present study was conducted to determine (i) the response of SOC stock to C input under different cropping pattern, (ii) C sequestration efficiency in different cropping pattern and (iii) the response of aggregate stability with increasing SOC stock in different cropping pattern. The findings will be helpful to understand about the role of carbon sequestration in agriculture towards climate change.

Methodology:

A field experiment was conducted in 2018 at four different cropping pattern long term fields in 3 different villages of Dumuria Upazila (sub-district), Khulna, Bangladesh. The Dumuria Upazila is located at 220 39’ and 220 56’ north altitude and 890 15’ and 890 32’ east longitude, surrounded by Jashore and Satkhira districts (SRDI 2008). Traditionally, rice, wheat and vegetables are the main crops that are being cultivated by the farmers. In this experiment, 4 types of cropping patterns were followed which have a monotonous soil texture. The soil samples were taken by shovel from the plough horizon (0–15 cm) from different parts of the respective cropping pattern field at early and end of the each cropping seasons and replicated 3 times. All core samples were randomly taken from individual cropping pattern field to determine the soil bulk density. After preparing soil samples, aggregate stability was measured by wet sieving method as proposed by Le Bissonnais (1996). Soil texture was determined by pipette method. SOC was determined by oxidation with potassium dichromate. Initial SOC data were taken from Fertilizer recommendation guide of Dumuria Upazila (SRDI 2008). So, the duration between the cropping field conditions was 10 years.

Source of Information: Bangladesh J. Bot. 50(4): 1029-1034, 2021 (December)

Article Link (Online Journal): DOI: https://doi.org/10.3329/bjb.v50i4.57069

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In Southwestern Bangladesh, intensive rice cultivation is widely practiced and culturally well accepted. Results showed that intensive long-term cultivation deteriorated soil organic carbon (SOC) and decline C-stock due to poor C-input thus reduced the rate of C-sequestration over the last ten years. Exception was happening in vegetable field (V-V-V) where SOC rate is higher due to addition of C externally thus improving resistance to climate change. Organic fertilization improved the C input and the quantity of SOC. The C sequestration rate was logarithmically related to the C input rate in all cropping pattern. Aggregate stability was higher in vegetable field due to higher organic carbon input and the relation between C-stock and aggregate stability showed that they were strongly correlated. It can be recapitulated that V-V-V cropping pattern (vegetable field) sequesters more SOC with higher efficiency than other cropping pattern. Results indicate that securing agricultural sustainability will require organic fertilization and proper soil management practice.

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