US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY US DEPARTMENT OF AGRICULTURE / SCIENCE PHOTO LIBRARY
Corn yield comparisons. Two cobs of corn that have been grown using different amounts of nitrogen fertiliser. The cob on the left has been grown in a fertiliser containing a higher concentration of nitrogen, giving a higher yield of corn. Photographed at the Colorado State University Arkansas Valley Research Center, Rocky Ford, Colorado, USA. August 14, 2008.
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