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This article in SSSAJ

  1. Vol. 30 No. 3, p. 317-320
    Received: Sept 17, 1965
    Accepted: Jan 6, 1966

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Formation of Surface Coatings on Limestone Particles in Soils1

  1. H. L. Barrows,
  2. E. C. Simpson and
  3. H. Y. Tu2



High-purity, 12- to 14-mesh calcite limestone was mixed into acid soils containing relatively large amounts of either P, Al, or Mn. These mixtures were equilibrated for 12 months, undergoing wetting and partial drying cycles. Samples of each mixture were withdrawn periodically, and the limestone particles were recovered and examined.

The surface of particles equilibrated in the high-P soil developed a porous, white granular coating. Ater 7 months' equilibration, this coating varied from about 0.03 to 0.1 mm in thickness. It was concluded that the coating formed through the combined processes of weathering, recrystallization of calcite, and adsorption and/or precipitation of phosphates from the soil.

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