| df_sordes | Example Data Frame for adsorption, desorption, and supply parameter |
| Freundlich_A | Freundlich isotherm fitted to adsorption data |
| Freundlich_D | Freundlich isotherm for desorption data in soil |
| Langmuir | Langmuir isotherm fitted to adsorption data |
| SP | Supply parameter of phosphorus in soil |