Described herein are implements and application units having a trench closer for closing a trench during applications with respect to agricultural plants of agricultural fields. In one embodiment, a trench closer for a fertilizer applicator includes a bar moved through a field transverse to a direction of travel, a fertilizer applicator connected to the bar for forming a trench in soil. The fertilizer applicator comprises a coulter, a knife, or a coulter and a knife, and a trench closer disposed behind the fertilizer applicator in the direction of travel and connected to the fertilizer applicator or the bar.
