Chisel Plough

A chisel plough is a primary tillage tool designed to loosen and aerate soil while conserving surface residue. Its narrow, curved shanks lift and shatter the soil as they pass, breaking clods and compacted layers, but they leave the soil essentially in place rather than turning a furrow slice.

This non-inversion action is the key contrast with the moldboard plough, which flips the soil and buries most residue. By keeping residue near the surface, the chisel plough helps protect against erosion and moisture loss while still achieving deeper loosening than most secondary tillage tools.

1. Staggered curved shanks are set across the frame to cover the working width
2. As the implement is drawn forward, each shank fractures and lifts a zone of soil
3. Compacted layers within the working depth are broken up, improving porosity
4. Surface residue is partially mixed but largely retained on top of the soil
5. The loosened, residue-covered surface is then usually refined by secondary tillage before sowing

The chisel plough is commonly chosen where growers want to loosen soil and relieve moderate compaction while keeping residue on the surface — a middle path between full inversion tillage and no-till. Retaining residue supports erosion control and moisture conservation, which makes the implement a frequent component of conservation-oriented tillage programmes.

Effective loosening depends on operating when the soil is neither too wet nor too dry: working wet soil can smear rather than shatter, while very hard dry soil greatly increases draught and fuel use. Working depth and shank spacing are matched to the compaction problem and the tractor power available.