The basic plough with coulter, ploughshare and mouldboard remained in use for a millennium.
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The Messinas opened their farm this month to allow people to view the mouldboard plough in action.
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Mr Newman compared a spading machine with a mouldboard plough on a two-hectare strip on the Messinas'farm.
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The holding force is the weight of the sod, as it is raised and rotated, on the curved surface of the mouldboard.
From the en.wikipedia.org
The reversible plough has two mouldboard ploughs mounted back-to-back, one turning to the right, the other to the left.
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Mouldboard ploughing, in cold and temperate climates, no deeper than 20 cm, aerates the soil by loosening it.
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For almost 150 years this loess deposit was farmed with mouldboard ploughs and fall tilled, both intensely erosive.
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The ploughshare spread the cut horizontally below the surface, so when the mouldboard lifted it, a wider area of soil was turned over.
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In part this is linked to technological developments, such as the mouldboard plough, that made life in once undeveloped areas more bearable.
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More examples
Moldboard: wedge formed by the curved part of a steel plow blade that turns the furrow
The plough (American spelling: plow; both) is a tool used in farming for initial cultivation of soil in preparation for sowing seed or planting. It has been a basic instrument for most of recorded history, and represents one of the major advances in agriculture. ...