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Elution of Potassium in Soil¹

ABSTRACT

Displacement of potassium in soil by a solution of calcium sulphate is considered. The basic assumptions are the existence of a state of microscopic equilibrium and neglecting dispersion. A model is developed and computed.

The computed curves reveal the existence of two potassium peaks moving during the first stages of the leaching, one peak in the solution front and the main peak behind it. The first peak disappears at advanced stages of the migration. The experimental curves showed the main peak at the predicted locations, and indicated the existence of the first peak, which was flatter than the computed ones.

The relative velocity of the displaced ion (R_f) is discussed and computed. This value can be easily obtained for different soils and solutions and is an important parameter for a number of practical problems. The computed and experimental values for the relative velocity of the eluted potassium were in good agreement.

¹ A contribution from the Soils and Fertilizer Laboratory, Technion—Israel Institute of Technology, Haifa, Israel. This work was partially supported through grant no. FG-Is-226 from the US Dept. of Agriculture.

² Senior Lecturer and Research Assistants, respectively. Received Jan. 12, 1970.

Received for publication January 12, 1970. Accepted for publication January 27, 1970.