Plunge shafts.
These shafts consist of narrow wedge rings, 60-70 cm in diameter, rotatably mounted on a common axis and separated by spacer sleeves. Each ring is equipped with a grease nipple. During operation, the rings easily sink into the soil and, by loosening its top layer, they simultaneously knead the subsoil. Such operation of the countersink enables the sowing of rye immediately after plowing (without waiting for it to settle freely) compact and medium-compact soils. Single sections of such a roller are often aggregated directly with the plow performing sowing plow.