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The Movement of Sulfate Salts in Soils¹

ABSTRACT

The movement of potassium sulfate in columns of calcium-saturated Cecil soil was studied. The desorption by hydrolysis of adsorbed SO₄^2- ions was found to influence the distribution of other ions in the columns. Leaching with 10.4 inches of water caused only slight hydrolysis of adsorbed SO₄^2- and adsorbed cations. Excessive leaching with 104 and 207 inches of distilled water caused considerable hydrolysis and displacement of adsorbed SO₄^2- as well as K⁺ and Ca²⁺.

The amount of hydrolysis in columns of calcium-saturated Yolo soil which does not adborb SO₄^2- was found to be much lower than in the Cecil soil columns.

Soil profiles taken from central Piedmont of Virginia showed substantially the same distribution of SO₄^2- as found in laboratory columns. The highest concentration of Mg²⁺ always was found to occur at the same depth as a maximum concentration of SO₄^2-.

¹ A contribution from the Agronomy Department, Virginia Polytechnic Institute, Blacksburg.

² Formerly Graduate Assistant, Virginia Polytechnic Institute, now Research Associate, Texas A&M University.

³ Formerly Associate Professor of Agronomy, Virginia Polytechnic Institute, now Professor, Texas A&M University.

Received for publication March 15, 1965. Accepted for publication April 28, 1965.