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Dissolution and Transport of Gypsum in Soils: I. Theory¹

ABSTRACT

A model was developed describing the dissolution and subsequent transport of gypsum from a soil column by combining the one-dimensional convection-dispersion equation with a kinetic expression for the dissolution process. The resulting partial differential equations were solved numerically by the method of lines. Results are presented showing the effect of the various parameters in the model on calculated concentration-time curves.

¹ Contribution from the USDA-SEA, Agricultural Research, and the Department of Agronomy, Colorado State Univ., Fort Collins, CO 80521. Journal Series No. 2299 of the latter. Research supported in part by OWRT Project A-017-COLO.

² Physiologist, Int. Potato Center, Lima, Peru; Soil Scientist, USDA-SEA and Professor of Soils, Agronomy Department; and Associate Professor of Agricultural Engineering, Colorado State Univ., Fort Collins, respectively.

Received for publication April 3, 1978. Accepted for publication November 22, 1978.