Agrisciece By betsyingle Sep 6, 1793 eli whitney- cotton gin Period: Sep 6, 1793 to Sep 6, 2013 agriscience Sep 6, 1800 thomas jefferson-iron plow Sep 6, 1834 cryus mccorick- grain reaper Sep 6, 1834 Henry blair- seed planter Sep 6, 1837 John Deere -steel moldboard Sep 6, 1850 Edmund quIncy-corn picker Sep 6, 1874 joseph glidden-barbbed wire Sep 6, 1878 AnnA baldwin-milking machiene Sep 6, 1879 thomas elkins- food preservation Sep 6, 1890 george washinton carver- soil improvment Sep 6, 1904 BeN holt -tractor Sep 12, 1917 smith hllghes Sep 6, 1987 john sanford-Gene gun Sep 6, 1990 robot milking machiene Sep 6, 1993 GPs technology