Who is the goddess of tillage and corn?

Demeter has been identified as the Greek goddess of corn. However, Demeter is more properly described the Greek goddess of grain, agriculture and the harvest since use of the Word "corn" can be misleading. Corn, in the American sense, refers to a plant (Zea mays) that was imported from the Americas into Europe after Columbus. Corn, in England, refers to wheat and other grains as well.