A moulboard plough that
produced a deep furrow and turned the earth after it had been cut
by the coulter and share. The moulboard was the device for guiding
the plough and turning the earth over. To get the right depth for
the seed the plough has to both cut and turn the earth. Moulboard
ploughs were mainly used in heavy clay areas. Farmers tended to prefer
wheeled ploughs on sandy soils.
Moulboard Plough,
Geoffrey Luttrell Psalter (1325)
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