The trenching knife in the micro tiller is mainly used for trenching during the cultivation process to deepen the soil looseness and facilitate crop cultivation. When using a micro tiller trenching knife, there are two common types: positive five opening and incorrect five opening. It is necessary to choose a suitable trenching knife according to actual needs, and determine the trenching depth and cutting angle based on different crops. Generally speaking, for flat and slightly sloping land, a regular five ditch cutter is more suitable. For steep mountain slopes, a staggered five ditch cutter is more suitable.