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Calculating Cation Exchange in a Salt Transport Model¹

ABSTRACT

A cation exchange subroutine that can be expanded to include any number of cations was developed and interfaced with a water flow-salt transport model that also contained a lime and gypsum precipitation-dissolution chemistry subroutine. The exchange subroutine was required by the complete model to satisfactorily predict EC, SAR, and specific ion concentration changes with time and depth for a gypsiferous and a non-gypsiferous soil irrigated with waters containing three different CaSO₄ concentrations at two leaching fractions. In his sudy, exchangeable Ca, Mg, Na, and K were considered. Exchangeable K was included for use with high exchangeable and soluble K soils and high K irrigation waters. The additional cation exchange coefficient values needed for K exchange and a method for their calculation is given.

¹ Contribution from the Dep. of Soils and Biometeorology, Utah State Univ., Logan, UT 84322 and USDA Sci. & Educ. Administration, Agric. Res., Snake River Conservation Research Center, Kimberly, ID 83341. This research was supported by the Office of Water Resources Research, USDI, Project no. JEA-113-1.

² Soil Scientist, Snake River Research Center, USDA, SEA, AR, Kimberly, ID 83341, and Professor and Assistant Professor of Soils and Biometeorology, Utah State Univ., Logan, UT 84322. respectively.

Received for publication January 17, 1980. Accepted for publication June 18, 1980.

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