EFFECTS OF SULPHUR DIOXIDE ON CALCAREOUS SOILS

The results of two series of greenhouse experiments indicate that unwanted sulphur dioxide emissions of the Southwest can be harnessed to improve local calcareous soils, and conversely, that these same soils constitute a safe disposal site for the polluting gas. In the first series, a low concentration of sulphur dioxide (equivalent to two tons of sulphur dioxide/ha-30 cm or 280 ppm S on a dry soil weight basis) was injected into two cultivated calcareous soils. Sulphuric acid, ferrous sulphate and gypsum at equivalent rates of S were used in parallel experiments. Sorghum was then grown on the soils for about two months. The results are tabulated and discussed. The increase in growth resulting from sulphur dioxide and sulphuric acid treatments was probably related to an increase in iron availability caused by localized acidification. The experiment indicates that soil injected sulphur dioxide is similar in effect to injected sulphuric acid which has been shown to be an effective amendment for calcareous soils. In the second experiment which was intended to determine the effects of injecting large amounts of sulphur dioxide into calcareous soils, rates of up to 700 tons/hameter were applied to two uncultivated calcareous soils. Details of the experiment are outlined and the results are tabulated and discussed. The absence of adverse effects, a large sulphur dioxide sorption capability and a rapid sorption rate were indicated. The gas conductivity of calcareous soils is high enough to allow direct injection of sulphur dixoide emission into the soils, for instance by using buried porous pipe. Revegetation of disposal sites is not considered a problem. A mathematical analysis of gas injection systems indicated that disposal of sulphur dioxide emission by this method is feasible. Gas streams with low concentrations of sulphur dioxide are the most suitable for disposal by this means.

  • Corporate Authors:

    Sulphur Institute

    1725 K Street, NW
    Washington, DC  United States  20006
  • Authors:
    • Miyamoto, S
    • Ryan, J
    • Stroehlein, J L
  • Publication Date: 1974

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  • Accession Number: 00264759
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 11 1975 12:00AM