KCSE Revision Notes on Chisel Plough – Agriculture Notes
Chisel ploughs are used to break through and shatter compacted or otherwise impermeable soil layers.
Deep tillage shatters compacted sub soil layers and aids in better infiltration and storage of rainwater in the crop root zone.
The improved soil structure also results in better development of root system and the yield of crops and their drought tolerance is also improved.
The functional component of the unit include reversible share, tyne (chisel), beam, cross shaft and top link connection .
Chisel plough consists of heavy chisel type tyne which is pulled through the soil normally at a depth greater than that at which conventional ploughing would be done and bursting up the underlying layers of soil without bringing the sub-soil to the surface.
The tynes of the implement are sturdy and strong enough to withstand the stresses applied when they are working at depth where the soil conditions are hardened.
The implement frame is also strongly constructed usually of box section steel to withstand the stresses applied.
The chisel plough has a sturdy but light structure made of 3 mm thick hollow rectangular tubular mild steel sections.
The share has a lift angle of 20 degree, width of 25 mm and a length of 150 mm.
The implement is protected by a shear pin,which prevents damage from over loading.
‘The implement could be used for deep
tillage upto a depth of 40 cm.
The cost of the implement is Rs.7,000/-. The coverage is0.42 ha/hr when operated at a spacing of 1.5 m between rows.
The salient features of the unit are:
The implement could be used for deep tillage up to a depth of 40 cm for bursting
of the sub-soil hard pan, improving the drainage and aerating the soil.
Reduces the bulk density of soil
Two fold increase in hydraulic conductivity of sub-soil
Conserves around 30 to 40% more soil moisture
Roots proliferation is improved from 40 to 45%
Nutrient mobility especially N and K increased by 20 to 30% and 30 to 40%
respectively.
Enhances the crop yield by 15 to 20%
Residual effect can be realized for three seasons
Easily operated by any 35 to 45 hp tractor
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