MEGAN THOMPSON:

Autumn means it's harvest time in Iowa, the heart of America's Heartland. Farmer Jeff Jorgenson is busy harvesting soybeans. He also grows corn on about 2,000 acres in the southwest corner of the state.

Farming is big business here in Iowa. This state is the biggest producer of corn in the country. And it's second only to Illinois in the production of soybeans.

For Jorgenson – whose family's been farming for four generations – it's all about keeping his yields as high as he can.