Maize and common beans were introduced as crops some 1,000 years ago to the land we now call Iowa. They marked the beginning of intensive agriculture in this area. But humans had begun evolving from hunter-gatherers to farmers several thousands of years earlier. This ancient agriculture in Iowa was characterized by changing patterns in the use of both native and introduced crops.
William Green, David Asch
Year of Grant Completion
Green, William and Asch, David, "Crops of ancient Iowa: Native plant use and farming systems" (1993). Leopold Center Completed Grant Reports. 35.