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In page Plough:

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Chisel ploughs are becoming more popular as a primary tillage tool in row-crop farming areas. Basically the chisel plough is a heavy-duty field cultivator intended to operate at depths from 15 cm (5.9 in) to as much as 46 cm (18 in). However some models may run much deeper. Each individual plough or shank is typically set from 230 mm (9 in) to 360 mm (14 in) apart. Such a plough can meet significant soil drag: a tractor of sufficient power and traction is required. When ploughing with a chisel plough, 10–20 horsepower (7.5–14.9 kW) per shank is required, depending on depth.[citation needed]