Agriscience Timeline By mollkaytrip Sep 6, 1793 Eli Whitney - Cotton Gin Period: Sep 6, 1793 to Sep 6, 2013 Agriscience History Timeline Sep 6, 1800 Thomas Jefforson - Iron Plow Sep 6, 1834 Cyrus McCormick - Grain Reaper Sep 6, 1834 Henry Blair - Seed Planter Sep 6, 1836 Henry Blair - Cotton Planter Sep 6, 1837 John Deere - Steel Moldboard Plow Sep 6, 1850 Edmund Quincy - Corn Picker Sep 6, 1874 Joseph Glidden - Barbed Wire Sep 6, 1878 Anna Baldwin - Milking Machine Sep 6, 1879 Thomas Elkins - Perishable Food Preservation Sep 6, 1890 George Washington Carver - Crop Rotation Sep 6, 1904 Ben Holt - Tractor Sep 12, 1917 Smith Hughes Act Sep 12, 1920 Virginia - FFA for boys Sep 12, 1928 FFA Becomes National Organization Sep 12, 1935 NFA For Black Students Sep 12, 1969 Girls Allowed In FFA Sep 6, 1987 John Sanford - Gene Gun Sep 6, 1993 GPS Technology Sep 6, 1997 Robotic Milking Machines