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Formation of Surface Coatings on Limestone Particles in Soils¹

ABSTRACT

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 Samples of each mixture were withdrawn periodically, and the limestone particles were recovered and examined.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.

¹ Contribution from the US Soils Laboratory, SWCRD, ARS and the Soil Survey Laboratory, SCS, USDA, Beltsville, Md.

² Research Soil Scientist and Physical Science Technician, US Soils Laboratory, ARS, and Geologist, Soil Survey Laboratory, SCS, respectively.

Received for publication September 17, 1965. Accepted for publication January 6, 1966.