Mineralogical Composition of Some Selected Paddy Soils of Bangladesh

• Kader Mohammed Abdul

  Department of Soil Science, Bangladesh Agricultural University

• Moslehuddin Abu Zofar Mohammad

  Department of Soil Science, Bangladesh Agricultural University

• Kamal Ahammad Mostafa

  Department of Soil Science, Bangladesh Agricultural University

• 森 裕樹

  九州大学大学院農学研究院環境農学部門生産環境科学講座土壌学研究室

抄録

Soil mineralogy, which largely affects the productivity of soil in low input agriculture, was determined for 28 widely distributed paddy soils from different agroecological regions (AEZs) of Bangladesh. In addition, particle–size distribution was analyzed through fractionation of soil particles into five groups viz. < 2, 2–20, 20–53, 53–200 and 200–2000 μm fractions. They represented 3–45, 6–59, 6–41, 3–41 and 0–49% of soil particles, respectively. The 2–20 μm silt fraction appeared to be the dominant fraction for most of our studied soils (17 out of 28 soils). The XRD patterns of the < 2 μm clay fraction indicated the presence of five layer silicate (mica, smectite, chlorite, vermiculite and kaolinite) and four complex minerals (quartz, feldspar, goethite and lepidocrocite) and two interstratified minerals (vermiculite–chlorite and mica–chlorite). Mica (20–50%) was the most predominant mineral identified in all the studied soils. Next to mica, chlorite (5–20%) and kaolinite (2–37%) were present in all the soils. Vermiculite (2–16%) was identified in 20 soils while smectite (1–11%) was identified in only 5 soils. In addition, vermiculite–chlorite intergrade (1–11%) and interstratified mica–chlorite (1–13%) was detected both in 11 soils. Other than layer silicates, quartz (4–21%) was the predominant non–silicate mineral identified in all the studied soils. Next to quartz, feldspars was identified in 26 soils with an approximate relative percentage ranges between 3 and 12%. Very small amount of goethite (1–2%) and lepidocrocite (1–3%) were identified only in 4 and 5 soils, respectively. According to the clay mineralogical composition, most of the studied soils were found at the initial stage of weathering, indicating the high potential to sustain low input subsistence agriculture.

収録刊行物

• Journal of the Faculty of Agriculture, Kyushu University

  Journal of the Faculty of Agriculture, Kyushu University 60 (2), 463-470, 2015-09-18

  九州大学大学院農学研究院

キーワード

• clay mineralogy
• paddy soil
• Bangladesh

詳細情報

• CRID: 1390290699661540736
• NII論文ID: 120005661383
• NII書誌ID: AA00247166
• DOI: 10.5109/1543410
• HANDLE: 2324/1543410
• ISSN: 00236152
• 本文言語コード: en
• データソース種別:
  • JaLC
  • IRDB
  • Crossref
  • CiNii Articles