The GS coulter is a seeding row unit designed primarily for use in grassland, under cover crops and in minimum tillage systems, where new seeds need to be sown without prior intensive tillage. Its design is based on a clear agronomic objective: to place the seed precisely into the existing soil, whilst maintaining the ground cover and preserving the soil structure.

The system is based on a large-diameter toothed single-disc furrow opener, capable of cutting through the vegetation cover, surface residues or the grass root mass. This clean cut allows a narrow row to be opened in the soil where the seed is deposited, minimising soil disturbance. Thanks to this method of operation, the GS system is particularly effective for grassland reseeding, establishing forage mixtures and sowing cover crops.

From a mechanical point of view, the GS arm is designed to ensure independent operation between sowing rows. Each row unit has its own elastomer that absorbs ground irregularities and allows the disc to follow the terrain individually. This design significantly improves performance on uneven surfaces, typical of permanent grassland or plots with micro-relief, preventing excessive variations in seeding depth.

The disc’s working angle is optimised to ensure efficient cutting of the vegetation cover and proper furrow opening, allowing the seed to be deposited in contact with the mineral soil. This aspect is particularly important for small seeds —such as many grass species— where correct placement directly influences the speed and uniformity of germination.

The system also allows for precise adjustment of the seeding depth, making it easier to adapt the coulter’s behaviour to different soil conditions, moisture levels or vegetation cover density. Maintaining a constant depth is a key factor in achieving uniform emergence, particularly when working on surfaces with varying degrees of compaction or areas with greater root development.

In addition to opening the furrow, the design of the GS coulter promotes good soil consolidation along the seed row, which improves contact between the seed and the soil. This contact is crucial for ensuring rapid and uniform germination, particularly in systems where the seed must compete with existing vegetation or make use of the moisture available in the topsoil.