Why Use a Roller?
Rolling flattens the land and it can be used to break up large clumps of soil.
Rolling is best carried out when there is give in the ground without it being too soft. Foot holes made by horses over the winter are removed and a flatter more level field makes weed control and field maintenance easier. Rolling also compacts the soil helping to reduce moisture loss.
Cambridge or Flat Roller
A one-piece roller has the disadvantage that when it turns corners the outer end of the roller has to rotate much faster than the inner end, forcing one or both ends to skid. When this occurs on soft ground, which is typically the best time to carry this out, then the soil at the outer edge will be pushed up in ridges. To prevent this the Cambridge roller has many small segments on one axle so that they can each rotate at local ground-speed.
In addition, the surface of rollers may be smooth, or textured to help break up soil or to groove the final surface to reduce scouring from rain. Each segment of a Cambridge roller has a rib around its edge for this purpose