ag history By marahsipe1 Period: Sep 1, 1793 to Sep 6, 2013 ag history Sep 6, 1793 cotton gin eli whitney invented the cotton gin. Sep 6, 1800 iron plow-thomas jefferson Sep 6, 1834 grain reaper-cyrus McCormink Sep 6, 1834 seed planter-henry blair Sep 6, 1836 cotton planter-henry blair Sep 6, 1837 steel moldboard plow- john deer Sep 6, 1850 corn picker-edmund quincy Sep 6, 1874 barbed wire-joseph glidden Sep 6, 1878 milking machine-anna baldwin Sep 6, 1879 perishable rood presrvation- thomas elkins Sep 6, 1890 soil improvement and crop rotaion george washinton carver developed crop roation and the use of legumes. Sep 6, 1904 tractor-ban holt Sep 12, 1917 smith- hodges act-money for ag classes Sep 12, 1928 FFA became a national organtation Sep 12, 1935 NFA for blacks Sep 12, 1950 ffa gains a federal charter Sep 12, 1965 ffa and nfa merged Sep 12, 1969 girls joined ffa Sep 6, 1987 gene gun-john sanford Sep 12, 1988 name change Sep 6, 1993 tractor gps1993 Sep 6, 1999 robotic milking