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Effect of Soil pH on the Availability of Adsorbed Sulfate¹

ABSTRACT

A soil solution displacement method was used to evaluate the effect of CaCO₃ on soil retention of sulfate. A decreased amount of sulfate retention was noted with increased rates of CaCO₃.

By means of a split-root technique, plants of soybeans (Clycine max (L.) Merrill) and cotton (Gossypium hirsutum L.) were grown in a Dothan subsoil which contained a large amount of adsorbed sulfate, and to which had been added several rates of CaCO₃. As CaCO₃ rate was increased the uptake of sulfate by five crops of soybeans and one crop of cotton grown successively in the same soil was generally greater. A portion of the adsorbed sulfate in the untreated soil was available, but available sulfate became limiting for the third crop of soybeans and for all successive crops of soybeans and cotton.

¹ Contribution from the Department of Agronomy and Soils, Auburn Univ. Agr. Exp. Sta., Auburn, Ala. 36830.

² Former NASA Trainee; and Head, Department of Agronomy and Soils, respectively. The senior author is now Assistant Professor of Plant Industries, Southern Illinois Univ.

Received for publication April 15, 1970. Accepted for publication June 2, 1971.