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Interaction of Limestone Particle Size and Phosphorus on the Control of Soil Acidity¹

ABSTRACT

Various size fractions of limestone and calcite were equilibrated in a Leon fine sand previously treated with varying rates of phosphorus. The efficiency of 42- to 48-mesh liming material was reduced 1.1, 1.6, and 5.8%, respectively, by the addition of 25, 50, and 150 ppm P. The same levels of P reduced the efficiency of 12- to 14-mesh material 2.2, 3.6, and 8.5%. Material finer than 80-mesh was not affected. The reduced efficiencies were attributed to the formation of surface coatings of phosphatic material. The susceptibility of a given soil to coat liming material may be assessed by measurements of hydrogen ion (H⁺) and phosphate (H₂PO₄^-) potentials.

¹ Contribution from the US Soils Laboratory, Soil & Water Conserv. Res. Div. ARS, USDA, Beltsville, Md. This investigation was supported in part by the US Atomic Energy Commission.

² Research Soil Scientists.

³ Physical Science Technician.

Received for publication April 10, 1967. Accepted for publication September 14, 1967.