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ABSTRACT
A comparison is made between two numerical models for simultaneous movement of water and salts in soil profiles. In the first model the water content and flux are constant during irrigation with time or depth (steady state model). In the second model the water contents and fluxes change with time and depth following each infiltration according to the hydraulic properties of the soil (transient model). From a comparison between data obtained with the two models, it is shown that both techniques yield comparable results when concentrations are plotted versus cumulative drainage. Measured effluent concentration distributions from columns periodically irrigated with labeled water, also compare well with effluent concentration distributions computed with the steady-state model.
1 Journal article no. 622, Agric. Exp. St., New Mexico State Univ., Las Cruces, NM 88003. The work upon which this publication is based was supported in part by funds provided through the New Mexico Water Resour. Res. Institute by the EPA, Grant no. S-803156.
2 Professor. Dep. of Agron., New Mexico State Univ., Las Cruces, NM 88003.
Received for publication March 28, 1977. Accepted for publication July 25, 1977.
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