MATHEMATICAL-MODELING OF SOIL BORON CONCENTRATION UNDER FIELD MOISTURE CONDITIONS USING THE LANGMUIR AND FREUNDLICH ADSORPTION-ISOTHERMS

Equations were developed that enabled the boron concentration at any s oil moisture content to be calculated from measured boron concentratio ns and water contents of a saturated water extract, the bulk density a nd the measured coefficients defining the Langmuir and Freundlich boro n adoption isotherms. The concentration-adsorption-moisture equations (CAM equations) have been tested against experiment data for three soi ls and two minespoils over a range of moisture oonditions. Also the CA M equations were used to predict potential boron phytotoxicity problem s associated with the amelioration of acidic minespoils with pulverise d fuel ash.