Quantification of the severity, reserve and extent of acidity in the twenty profiles of acid sulfate soils and their threats to environment
2007
Khan, M.H.R. (Okayama Univ. (Japan). Dept. of Environmental Management Engineering) | Blume, H.P. (University of Kiel (Germany). Inst. for Plant Nutrition and Soil Science) | Kabir, S.M. (Dhaka Univ. (Bangladesh). Dept. of Soil, Water and Environment) | Bhuiyan, M.M.A. | Ahmed, F. | Syeed, S.M.A.
Selected characteristics of acid sulfate soils that are arising problems to environments were investigated during 1999 to 2001. The studied soils occurred in eight series and classified as Salidic Sulfaquept and Typic Sulfic Halaquept (new name to be considered for soil classification). Due to heavy rain, flash flood and wide spread run off from adjacent hill areas, the surface soils were eroded by about 10 to 30 cm during the last decade. Yellow patches resembling Jarosite were identified at the depths of 10 to 150 cm in the 20 profiles, which making not only acidity problems of the soils but also creating a lot of troubles to the surroundings. Most of the studied soils are rich in clay. Exchangeable sodium percentage of the soils ranged from 14 to 55. Extreme pH values (2.6-5.2) were observed in the studied profiles. The content of total sulfuric acidity of the soils ranged from 3 to 19 c mol per kg. The pH and EC values of water samples collected from the nearby ditches, ponds and rivers ranged from 3.1 to 7.2 and 1.2 to 7.0 dS m-1 and the high concentrations of SO4(2-) (1096 to 1314 mg L-1) and Al3+ (1 to 17 mg L-1) in the samples were determined round the year.
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