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 in to as much as 46 cm in. However some models may run much deeper. Each individual plough or shank is typically set from nine inches (229 mm) to twelve inches (305 mm) apart. Such a plough can meet significant soil drag, so that a tractor of sufficient power and traction is required. When planning to plough with a chisel plough, it is important to note that 10–20 horsepower (7.5 to 15 kW) per shank will be required, depending on depth.