Two John Deere 7780 Pro Drive Forage Harvesters Opening a Corn Field July 23, 2015 by farmlifetoday bigtractorpowerThu, July 23, 2015 3:14pmURL:Embed:The 2015 corn silage season is underway. Two John Deere 7780 Pro Drive forage harvesters opening a corn field. Visit www.bigtractorpower.com