Seems to me there was a film which at least included corn made in conjunction with the "Seeds of Change Exhibit" out of the Smithsonian.  You might look at the SoC page at:  http://www.mnh.si.edu/garden/ to see what shows up there.  If all else fails, I know the last museum I worked for had copies of films related to that exhibit - contact me off-list and I'll give you a name and address.

Chris Dill, Superintendent
City of Greeley Museums
919 7th Street
Greeley  CO  80631
T:  (970)350-9217
F:  (970)350-9570
E: [log in to unmask]
www.greeleymuseums.com

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