The piece of equipment used to break clods of soil and cover seeds after sowing is called a "cultivator" or a "tiller." Cultivators or tillers are agricultural implements designed to loosen and prepare the soil for planting by breaking up clumps of soil, leveling the surface, and incorporating organic matter or fertilizers. They typically have rotating tines or blades that penetrate the soil and break it up, creating a finer seedbed. After sowing the seeds, the cultivator or tiller can be used to lightly cover the seeds with soil, ensuring proper seed-to-soil contact for germination.