In this conservation tillage system, equipment is used to move soil so the crop row is slightly elevated. This system is usually used on soils that may drain poorly or warm slowly in the spring. The rows are maintained in the same location each season and at planting the top of the ridge are leveled off. Planting on these ridges provides warmer conditions for early plant growth. In most cases, the residue on the soil surface between ridges is not disturbed and provides for moisture conservation during the season.