KCSE Revision Notes on Rotary Tiller – Agriculture Notes
The rotary cultivator is widely considered to be the most important tool as 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.
The functional components include tynes, rotor, transmission system, universal joint, leveling board, shield, depth control arrangement, clutch and three point linkage connection Rotary tiller is directly mounted to the tractor with the help of three point linkage.
The power is transmitted from the tractor PTO (Power Take Off) shaft to a bevel gear box mounted on the top of the unit, through telescopic shaft and universal joint.
From the bevel gear box the drive is further transmitted to a power shaft, chain and sprocket transmission system to the rotor.
The tynes are fixed to the rotor and the rotor
with tynes revolves in the same direction as the tractor wheels.
The number of tynes varies from 28 – 54.
A leveling board is attached to the rear side of the unit for leveling the tilled soil.
A depth control lever with depth wheel provided on either side of the unit ensures proper depth control.
The cost of the unit varies from Rs.62, 000/- to 1,10,000/-.
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.
The benefits of the rotary tiller are effective pulverization of soil ensures good plant growth, stubble and roots are completely cut and mixed with the soil and proper ground leveling after the operation.
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