| บทคัดย่อ(English) |
The chemical substance used for agricultural planting has a direct effect on soil. An adequatequantity of chemical substance used has benefit to crops. The exceeded quantities of thechemical used will store in soil. Sodium is one of the chemical substances causing toxic tosoil texture and crops. In experiment, we have observed the sodium adsorption in a sandy loamsoil from sodium chloride solution and collected the data to obtain the adsorption modeling.The Convection - dispersion equation (CDE) is proposed to describe the solute transport. Theresult of CDE can predict the amount of sodium at different depths from the ground surface andalso at different times. The model can be used to consider the adsorption of the various soilsby the initial and boundary condition of the specified soil system. |