How do grain drills work?

Grain drills are agricultural machines used for planting seeds in rows at specific intervals. They function by using a series of tubes and a metering mechanism to control the flow of seeds from a hopper into the soil. As the drill is pulled across the field, it creates furrows, deposits seeds at a consistent depth, and covers them with soil, ensuring proper seed-to-soil contact for optimal germination. Some grain drills also include features for fertilizer application and row spacing adjustments.