Check the Drained column box to indicate if the field is artificially drained.  If this is a field with a soil with Poor or Very Poor drainage, checking this box may increase the amount of N recommended for corn. There are a number of Loamy soils with Poor or Very Poor drainage that were in the High or Very High yield potential category for corn prior to the 2012 A2809 updates, but now are listed as Medium yield potential due to drainage limitations. Artificial drainage changes corn yield potential from Medium to High for Loamy soils that have no yield restriction other than Poor or Very Poor drainage. This drainage category includes ditches, so checking here does not automatically check Tile lines present in field in the Spreading Restriction Features box.