Predicting salinization and sodification of a bare sandy loam soil after irrigation with poor-quality water interspersed with rain
1986
Kapoor, A. K. | Pal, R.
Using models based on miscible displacement and cation exchange, we predicted accumulation of total salts and exchangeable sodium in a sandy loam soil after redistribution, as well as evaporation, after irrigations with saline sodic water or rain. We modified the Burns model by replacing the evaporation limit with actual moisture content in the soil profile to predict electrical conductivity (EC1:2, mmhos cm) at various soil depths. The model used for predicting exchangeable sodium percentage (ESP) was based on the Gapon equation to describe cation exchange equilibrium. To test these models, experimental data were collected from a 3.6− ± 3.6-m plot for a cycle of nine irrigations with water of high sodium adsorption ratio (SAR) interspersed with different intensity rains. The observed values of EC and ESP were in good agreement with those predicted for different soil layers.
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