The tractor, the most frequently used machine on the farm, has two large wheels at the rear that provide the power and two smaller ones at the front for steering, with an engine in the centre. Tractors come in many sizes and have a shaft at the back that turns and provides power to other machines that it pulls. Cultivator A cultivator has a series of sharp teeth mounted on spring arms that are pulled over the field by a tractor in the spring to prepare the ground for planting seeds. A hose runs from the box to each of the disks to carry the seeds.
Farmers use planters to put seeds in even rows across the field.
Fertilizer is usually applied on or beside the seed row. Planters are pulled by a tractor to apply seed and fertilizer.