简介：Elovich,two-constant,parabolicdiffusion,exponential,second-order,first-orderandzero-orderequationswereusedtodescribethekineticcharacteristicsofpotassiumdesorptionfromsixpaddysoilsofZhejiangProvinceinaconstantelectricfield(44.4V/cm)ofEUF.Resultsshowedthatthesecond-orderandElovichequationscoulddescribethepotassiumdesorptionkineticsbest,asevidencedbythehighestcorrelationcoefficients(r)andtheloweststandarderrors(SE).Thefirst-order,two-constantandparabolicdiffusionequationsalsodescribedtheKdesorptionkineticswell,asshowedbytherelativelyhighcorrelationcoefficientsandrelativelylowstandarderrors.Thezero-orderequationdidnotdescribetheKdesorptionsatisfactorilywitharelativelylowcorrelationcoefficientandrelativelyhighstandarderror.However,theexponentialequationcouldnotbeusedtodescribetheKdesorptionkinetics,duetothelowestcorrelationcoefficientandthehigheststandarderror.