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The present invention provides a machine for easily supplying water and chemicals as well as functioning as a labor saving machine for performing a rotary action of water supplying and chemical spraying processes. The present invention relates to the labor saving machine for cultivating crops with a rotary device which comprises the following : a connection stand (3) vertically installed on the rear side of the rotary device; an upper connection stand (4) crossing the connecting stand (3) to the horizontal direction; a connection arm (11) and a T-shaped member (30) connected to the upper connection stand (4); a rear connection stand (33) connected to the T-shaped member (30); a vertical beam (12) connected to the rear connection stand to the vertical direction; a supplying pipe (17) with a through-hole (18) on the lower side, connected to the vertical beam to the horizontal direction to cross the vertical beam; a connection hose (14) connected to the supplying pipe; and a water container (13) connected to the connection hose.