Download the file soil_dose.eco and open it in Ecolego by clicking the button, or by selecting File | Open from the Menu bar.
The agricultural sub-system has a transfer named “Deposition”. The deposition rate is defined as a parameter, making it impossible to run a simulation with a time-varying deposition rate – for instance contamination during a limited time. You will create a General Variable that allows different ways of entering values for deposition.