Rotary tiller

• It provides fine degree of pulverization enabling the necessary rapid and intimate mixing of soil besides reduction in traction demanded by the tractor driving wheels due to the ability of the soil working blades to provide some forward thrust to the cultivating outfit.
• Rotary tiller is directly mounted to the tractor with the help of three-point linkage.
• A levelling board is attached to the rear side of the unit for levelling the tilled soil.
• A depth control lever with depth wheel provided on either side of the unit ensures proper depth control.
• The following types of blades are used with the rotor.

i. ‘L’ type blade – Works well in trashy conditions, they are more effective in cutting weeds and they do not pulverize the soil much.

ii. Twisted blade – Suitable for deep tillage in relatively clean ground, but clogging and wrapping of trashes on the tynes and shafts.

iii. Straight blade – Employed on mulchers designed mainly for secondary tillage.

Chisel plough

• Chisel ploughs are used to break through and shatter compacted or otherwise impermeable soil layers.
• The functional component of the unit includes reversible share, tyne (chisel), beam, cross shaft and top link connection.

Sub-Soil plough

• The function of the sub-soiler is to penetrate deeper than the conventional cultivation machinery and break up the layers of the soil, which have become compacted due to the movement of heavy machinery or as a result of continuous ploughing at a constant depth.
• The sub-soiler consists of heavier tyne than the chisel plough to break through impervious layer shattering the sub-soil to a depth of 45 to 75 cm and requires 60 to 100 hp to operate it.

Methods of ploughing

• It includes gathering and casting.

a) Gathering – Whenever a plough works round a strip of ploughed land, it is said to be gathering.

b) Casting – Whenever a plough works round a strip of unploughed land, it is said to be casting.