1) Mouldboard 2) Wedge 1) Mouldboard 
I took this picture during my visit to Xiamen, China in April, 2006 ...
• (n.) Alt. of Mouldboard
(from the article `agricultural technology`) Equipment used to break and loosen soil for a depth of six to 36 inches (15 to 90 centimetres) may be called primary tillage equipment. It includes ... ...the heavier soils of northwestern Europe. The wheeled plow, at first drawn by oxen but later by horses, made possible the northward spread...
[n] - wedge formed by the curved part of a steel plow blade that turns the furrow
mouldboard noun wedge formed by the curved part of a steel plow blade that turns the furrow
the curved metal plate in a plow that turns over the earth from the furrow. · a large blade mounted on the front of a bulldozer to push loose earth. · a board forming one side or surface of a mold for concrete.