Some fields have non-productive areas inside, like lagoons and trees. You need to create a inner border inside your field so Atfarm doesn't calculate the average amount of fertlizer for your field with this areas.
To do this, do the following:
- click on inner border on the navigation menu.
- click with your cursor onto one border of the area you want to exclude.
- trace along the area you want to exclude.
- double-click on the first point you added.
- click save field.