Design and Performance Testing of a Tractor-Integrated Corn Seed Planter on Performance Parameters and Planting Accuracy

In the vast fields of Indonesia, corn is more than just a crop; it is a pillar of national food security and a vital ingredient for the animal feed industry. For generations, planting this crop has relied on human hands, a labor-intensive process where farmers walk the fields, digging holes and dropping seeds one by one. While this method has served communities for centuries, it is becoming increasingly difficult to sustain. The workforce is shrinking, and the physical demands of manual planting often lead to uneven results. When seeds are placed too close together or too far apart, the plants end up competing for the same water and nutrients, which ultimately lowers the harvest. To solve this, engineers are turning to machines that can do the work of many people at once. The goal is not just to speed up the process, but to achieve a level of precision that human fatigue makes impossible: placing every single seed at the exact same distance from its neighbor, in the perfect spot to grow.

A team of researchers at the University of Mataram set out to design and test a new machine that attaches to a standard four-wheel tractor to automate this planting process. Their creation is a mechanical planter that opens the soil, drops a seed and fertilizer, and closes the furrow all in one smooth pass. The device is driven by the tractor's own wheels; as the tractor moves forward, the rotation of the rear wheels powers a mechanism that picks up corn seeds and releases them into the ground. The researchers were particularly interested in finding the "sweet spot" for speed. They knew that driving faster would cover more ground, but they suspected that moving too quickly might cause the machine to stumble, dropping seeds in clumps or missing spots entirely. To find the truth, they took their prototype to a dry, prepared field and put it through its paces at three different speeds: a slow 3.0 kilometers per hour, a moderate 4.5 kilometers per hour, and a fast 6.0 kilometers per hour.

The results of the field tests revealed a clear trade-off between speed and precision. When the tractor moved at the fastest speed of 6.0 kilometers per hour, the machine did indeed cover the most ground, planting 0.52 hectares in an hour. However, this speed came at a steep cost to accuracy. The rapid movement caused the tractor's wheels to slip slightly on the dry soil, and the machine began to vibrate. These vibrations and the loss of traction disrupted the delicate timing of the seed release. Instead of dropping one seed at a time, the machine began to drop two or three seeds together in some spots and leave large gaps in others. The quality of the planting dropped significantly, with the accuracy index falling to just 71.2 percent, meaning nearly one out of every three seeds was either missing or placed incorrectly.

In contrast, the moderate speed of 4.5 kilometers per hour proved to be the ideal operating condition. At this pace, the machine maintained a steady rhythm, allowing the internal mechanism to pick up and release seeds with remarkable consistency. The researchers found that the actual distance between the planted seeds averaged 20.3 centimeters, which is almost identical to the target distance of 20.0 centimeters. The accuracy index remained high at 92.4 percent, a level the researchers classified as "very good." While the machine covered slightly less ground per hour compared to the fastest setting, it did so with a level of efficiency and precision that maximized the potential for a successful harvest. The slower speed of 3.0 kilometers per hour was also accurate, but it did not offer the same balance of speed and quality as the moderate setting.

The study concludes that for this specific type of mechanical planter, pushing the machine to its maximum speed is counterproductive. The extra time saved by driving faster is lost when the machine fails to plant the seeds correctly, leading to wasted resources and a lower final yield. The researchers determined that 4.5 kilometers per hour is the optimal speed for this equipment in dry land conditions. This finding provides a clear guideline for farmers and engineers: to get the best results, the machine should be operated at a steady, moderate pace that keeps the planting mechanism stable. By adhering to this speed, farmers can ensure that every seed has the best chance to grow, turning the mechanical advantage of the tractor into a reliable and efficient agricultural tool.