Calculating Cation Exchange in a Salt Transport Model1
- C. W. Robbins,
- J. J. Jurinak and
- R. J. Wagenet2
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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