Sunlight streams into a corn storage building at a Michlig Grain storage facility in Sheffield, Illinois, U.S., on Oct. 31, 2014. The price of corn has been falling for months.
Daniel Acker/Bloomberg via Getty Images
A corn purchaser writes on his account in northwest China in 2012. In November 2013, officials began rejecting imports of U.S. corn when they detected traces of a new gene not yet approved in China.
Wheat fields like this one could yield wheat with less zinc and iron in the future if they are exposed to higher levels of CO2, according to the journal Nature.
Rowbot is designed to fit in between the rows of crops. Moving up and down each row, a fleet of 20 bots could fertilize and monitor the corn crops during the growing season.
Courtesy of Kent Cavender-Bares