In order to overcome the seed placement problems in
conservation tillage systems, Erbach (1981) suggested
equipping row-crop planters with rolling coulters.
Rolling coulters cut the soil and trash, helping correct
seed placement. According to Raoufat and Mahmoodieh
(2005), planters equipped with rolling coulter
attachment improves seeding indices in conservation
tillage systems. They observed that plain rolling coulter
has better performance as compared to notched ones
specially for planting corn in irrigated wheat residues.
Karll et al. (1978) concluded that plain and rippled
coulters cut the trash more clearly as compared to
notched ones. They noticed that rolling coulter of
0.46 m diameter worked well in heavy residue
conditions.