As a final step, add the three components to the built-in library.

1. Right-click the Agricultural Land sub-system in the Projects window. Select Library |Add to library.
   
2. In the window that appears, write a description of the sub-system. Click Ok.
3. Add the two remaining sub-systems to the library.
4. Create a new project by clicking the button on the toolbar or by selecting File | New from the Menu bar.
5. Right-click a diagonal cell in the matrix and select Get from library…
6. Select the Agricultural Land sub-system and click Ok.
7. Right-click another diagonal cell in the matrix and select Get from library…
8. Select the Concentrations in Food sub-system and click Ok.
9. When you add a sub-system which has inputs with the same name as outputs in other sub-systems, Ecolego will ask you if you want to connect these inputs. Answer Yes to this question.
10. Right-click another diagonal cell and add the Doses sub-system to the model.
11. Run a simulation and see if you get the same results as before.
    

Solution to the excersise

• soil_dose.eco

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References

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