No. Wheat farming is and can be located where corn is being farmed, just in different fields from that of the corn field.
The farming of corn in Peru started in 1200 B.C.
CORN! CORN! and more CORN!
corn
CORN
farming < a grain??>
CORN
at this time soybean and corn
they farmed corn
in the 1990's
corn, potatoes, carrots, and more
farming (corn, soybeans, wheat, sorghum), grain processing, meat-packing the Air Force Strategic Air Command,