KCSE Revision Notes on Types of mould board – Agriculture Notes
a) General purpose: It is a mouldboard having medium curvature lying betweenstubble and sod types.
The mouldboard is fairly long with a gradual twist, the surface being slightly convex.
The sloping of the surface is gradual.
It turns a well defined furrow slice and pulverizes the soil thoroughly.
b) Stubble type: It is short but broader mouldboard with a relatively abrupt curvature which lifts, breaks and turns the furrow slice.
This is best suited to work in stubble soil
that is under cultivation for years together.
Stubble soil is that soil in which stubble of the plants from the previous crop is still left on the land at the time of ploughing.
This type of mouldboard is not suitable for lands with full of grasses.
c) Sod or Breaker type: It is a long mould board with gentle curvature which lifts and inverts the unbroken furrow slice.
It turns over thickly covered soil.
This is very useful where complete inversion of soil is required by the farmer.
This type has been designed for used in sod soils (soil with much of grass).
d) Slat type: It is a mouldboard whose surface is made of slats placed along the length of the mouldboard, so that there are gaps between the slats.
This type of mouldboard is often used, where the soil is sticky, because the solid mouldboard does not scour well in sticky soils.
4) Land side: It is the flat plate which presses against and transmits lateral thrust of the plough bottom to the furrow wall (Fig.6 ).
It helps to resist the side pressure exerted by the furrow slice on the mouldboard.
It also helps in stabilizing the plough while in operations.
Land side is fastened to the frog with the help of plough bolts.
The rear bottom end of the land side is known as heel which rubs against the furrow sole.
5) Frog: Frog is that part of the plough bottom to which the other components of the plough bottom are attached.
It is an irregular piece of metal.
It is made of cast iron for cast iron ploughs or it may be welded steel for steel ploughs.
6) Tail piece: It is an important extension of mouldboard which helps in turning a furrow
slice
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