An agricultural field unit taking the form of a vehicle for applying by spray means irrigation water or other fluids to crops. The unit is powered during its operational run by the same water supply that provides the irrigation water for spraying purposes. A winch and winch cable are employed to mark exactly the destination point for the vehicle during its water-powered run. The vehicle carries a hose reel the hose of which is alternately transported, attached to a water pressure source and spooled off the reel during a primary vehicle run, and then coupled to the fluid inlet of the vehicle and dragged thereby over the field during the intended sprinkling operation.
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