Agricultural implements are tools or equipment used in farming, especially to prepare soil and support the production of food and fiber. The USDA’s terminology for tillage implements includes primary-tillage tools such as plows, chisel plows, disks, bedders, subsoilers and rotary tillers; secondary-tillage tools include harrows, cultivators, rollers and levelers. The USDA standard excludes implements designed for earth movement and transport.
Source: Terminology and Definitions for Agricultural Tillage Implements — USDA