PURPOSE: To save, reduce and facilitate the labor of agricultural work.

CONSTITUTION: Grooves 2 are formed on the soil surface of a field 1 at proper intervals and the parts between the grooves are used as the planting faces 3. A guiding track 7 composed of a pair of rails 7a, 7b is laid on both lateral edges of each planting face and a working truck 8 guided by the guiding track is placed on the track. A transportation track 21 is laid to guide the working truck to an arbitrary guiding track and a working machine selected from various machines 12 is attached to the working truck to perform various agricultural works.