Big Ag

Like most farmers, Mark Nelson, who grows corn, soybeans and wheat near Louisburg, Kan., is getting squeezed. He's paying three times more for seed than he used to, while his corn sells for less than half what it brought four years ago.

"It's a – that's a challenge," Nelson says. "You're not going to be in the black, let's put it that way."

Low commodity prices are rippling up and down the farm-economy food chain — from the farm to the boardroom — and it has many of the huge companies that control farm inputs looking to a new future.