Effects of incubation times and moisture regimes on pH values and exchangeable cations in acid sulfate soils as influenced by application rates of basic slag

Abul Hasnat Md Shamim, Md Harunor Rashid Khan, Takeo Akae

Research output: Contribution to journalArticle

Abstract

Severe acidifications in acid sulfate soils (ASSs) have occurred worldwide due to sulfuric acidity, which requires sustainable measures for their reclamation. Accordingly, an incubation study was conducted with the topsoil of two different ASSs (Cheringa and Badarkhali) to evaluate the effects of basic slag (BS; size <1 mm, pH 9.6, Ca 20.8%, Mg 9.8%, etc.), on reduction of acidity and changes in exchangeable cations. It is noted that BS is a byproduct of steel industry in Bangladesh and can be collected almost free of charge. These soils received BS at the rate of 0 (T0), 11 (T1), 22 (T2) and 33 (T3) t ha-1 under various moisture regimes (saturated condition M1,, i.e., 100% moisture content, wetting-drying cycles of 100 and 50% moisture M2, and moisture at field condition M3, i.e., 50%). The impacts of these treatments on some selected parameters in these soils were studied within 180 days of incubation. The application of BS was found to increase the pH of soils from 3.6 to 5.1 for Cheringa, 3.9 to 5.2 for Badarkhali soils at the end of incubation. These increments were more striking with the highest doses of BS under saturated moisture conditions in both of the soils. The ECe of the soils was not much influenced by the application of BS regardless of time. The treatments exerted significant (P ≤ 0.05) effects on exchangeable cations in different periods of incubation. The striking changes were recorded for the rate of increments of Ca2+ and Mg2+, which were about 2-3 times higher for Ca and more than 2 times higher for Mg2+ compared with the control after 180 days of incubation. These results suggest that the application of BS not only increased the Ca2+ to the higher amount than that of the increment of Mg2+ in the soils, but also improved one of the important criteria of Ca2+ and Mg2+ ratio in the soils.

Original languageEnglish
Pages (from-to)95-103
Number of pages9
JournalPaddy and Water Environment
Volume7
Issue number2
DOIs
Publication statusPublished - Jun 1 2009

Keywords

  • Acid sulfate soils
  • Basic slag
  • Exchangeable cations
  • Incubation time
  • Moisture regimes

ASJC Scopus subject areas

  • Environmental Engineering
  • Agronomy and Crop Science
  • Water Science and Technology

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