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Agrculture  updated yahoo
sitebuilder 12 29 2010
English writer and pioneer agronomist, Tull, who
invented a horse-drawn drill around 1701. He
promoted sowing seeds in rows rather than
broadcast (simply casting the seeds around), so that
weeds could be controlled by hoeing regularly
between the rows. For this purpose, he devised his
seed drill, which could planted three rows atthe same
time. A blade cut a groove in the ground to receive
the seed, and the soil was turned over to cover the
sewn seed. A hopper distributed a regulated amount
of seed. Because of the internal moving parts, it has
been called the first agricultural machinery. Its rotary
mechanism became part of all sowing devices that
followed. Tull also invented a four-coultered plow to
make vertical cuts in the soil before the plowshare.«
[Image right: Tull's seed drill]