To investigate the thermodynamics parameters for adsorption-desorption behavior of metolachlor (nonionic herbicides) and 2,4-D (anionic herbicides) on the selected soils by using a kinetic approach. The objective of this study to investigate the rate constants and other kinetic parameters for the adsorption-desorption behavior and to elucidate the effect of temperature, the experiments were done at 10, 25, 40 ±1 ℃. Data from the experiments revealed that the adsorption-desorption of metolachlor and 2,4-D on the selected soil samples followed the first order rate law, and revealed that adsorption of metolachlor and 2,4-D was spontaneous exothermic, a partly physical and partly chemical in nature to some extent. Values of adsorption rate constant k a were in the range 0.853 -2.263 and 0.765 -2.399 for metolachlor and 2,4-D respectively, desorption rate constant k d were in the range 0.744 -1.303 and 0.705 -1.289 for metolachlor and 2,4-D respectively. By using the Arrhenius equation the activation energy of each adsorption-desorption of both pesticides were calculated. The activation energy E a for adsorption processes followed the range 14.667 -17.361 kJ·mol , and -16.292 to -61.292 J·mol -1 ·K -1 for metolachlor and 2,4-D respectively.