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International Journal of Soil Science
  Year: 2017 | Volume: 12 | Issue: 3 | Page No.: 120-127
DOI: 10.3923/ijss.2017.120.127
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Distribution and Stratification of Carbon in Irrigated Calcareous Soil under Rice-based Cropping Pattern in Bangladesh

M. Hasinur Rahman

Background and Objective: Agricultural activities release three primary greenhouse gases to atmosphere which are responsible for climate change. Soil, a natural capital is considered as a big reservoir of carbon dioxide (CO2). Irrigation may or may not change soil carbon in a desirable direction. It is, therefore, important to evaluate soil carbon in irrigated soils. The objective of this study was to evaluate the influence of irrigation on soil carbon dynamics in a tropical calcareous soil under rice-based cropping systems. Materials and Methods: Soil organic and inorganic carbon stock and their stratification were evaluated from three soil series located in same catena of Ganges-Kobadak (G-K) irrigation project as well as adjoining non irrigated area of G-K soils which were calcareous in nature. Two-way analysis of variance (ANOVA) was undertaken for all factors. All statistical analyses were performed by JMP 4.0 (SAS Institute, Cary, North Carolina, USA). Results: Soil organic carbon (SOC) was increased due to long-term irrigation in calcareous soils irrespective of soil depth and series. The research showed the significant loss of soil inorganic carbon (SIC) under irrigated condition compared to non irrigated condition regardless of soil series. Soil organic carbon density was lower in coarse textured soils than fine textured soils while in case of SIC it was higher in coarse textured soils than fine textured soils, regardless of management practices and soils. The potential SOC stock was higher in non irrigated soils than irrigated soils and the reverse was true for the SIC. Stratification ratios of SOC under irrigated soils were significantly higher than under non irrigated soils. On the other hand, the stratification ratios of SIC was significantly lower under irrigated soils than under non irrigated soils. Conclusion: Results indicated that irrigation practices may slightly increase SOC but remarkable decrease SIC in calcareous soils.
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How to cite this article:

M. Hasinur Rahman , 2017. Distribution and Stratification of Carbon in Irrigated Calcareous Soil under Rice-based Cropping Pattern in Bangladesh. International Journal of Soil Science, 12: 120-127.

DOI: 10.3923/ijss.2017.120.127






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