A combined seed drill, also known as a combination seed drill or seed drill-cum-fertilizer, is a versatile agricultural machine used for sowing seeds and applying fertilizer simultaneously in a single pass. It’s a valuable piece of equipment that helps farmers efficiently plant crops while providing the necessary nutrients for early growth. Here’s how a combined seed drill typically works:

Seed Hopper: The combined seed drill is equipped with one or more seed hoppers or compartments where seeds are stored. These hoppers can hold a significant quantity of seeds, allowing for continuous planting without frequent refilling.

Fertilizer Hopper: In addition to the seed hopper(s), it has a fertilizer hopper for storing granular or pelletized fertilizers. This hopper is typically mounted in the same frame as the seed hopper.

Metering Mechanism: Within the seed hopper, there is a metering mechanism that precisely measures and controls the flow of seeds. Similarly, the fertilizer hopper has a metering mechanism to control the application rate of fertilizer.

Seed and Fertilizer Delivery: The seeds and fertilizer are conveyed from the respective hoppers to the planting units and fertilizer distribution system through separate mechanisms. These mechanisms can include augers or belts.

Planting Units: The planting units are responsible for placing the seeds into the ground at the desired spacing and depth. Each planting unit typically includes components like seed tubes, seed meters, and coulters for accurate seed placement.

Fertilizer Distribution: The fertilizer distribution system evenly spreads the fertilizer alongside the planted rows. It often consists of spinning discs or spreader mechanisms that broadcast the fertilizer at a consistent rate.

Depth Control: Combined seed drills are equipped with depth control wheels or furrow openers that set the planting depth for both seeds and fertilizer. This ensures that seeds and fertilizer are placed at the correct depth for optimal germination and nutrient uptake.

Row Markers: Some combined seed drills include row markers that create visible lines in the field to guide the tractor operator during planting. These markers help maintain proper row spacing and alignment.

Monitor and Control System: Many modern combined seed drills are equipped with advanced monitor and control systems. These systems allow operators to adjust planting rates, fertilizer application rates, and monitor seed and fertilizer levels in real-time.