Area III Agricultural Mechanization, Power, Machinery and Equipment and Allied Subjects Practice Exam

Calibrating how many seeds are dropped per unit distance is the key idea here. The metering rate is governed by how many seeds the meter releases as the planter travels, and the ground wheel provides the built‑in measure of travel distance that drives or correlates with that seed release. By rotating a known amount of the ground wheel (or measuring seeds dropped over a known wheel-revolution distance), you can adjust the metering mechanism to achieve the desired seeds-per-meter rate. Since the ground wheel ties seed release directly to field distance, it’s the component typically used to calibrate the seed metering rate.

The other parts have different roles: the metering sleeve or metering wheel controls how many seeds are dropped per metering cycle; the hopper stores seed; the seed tube guides seeds to the furrow.