A field crop spray apparatus comprises a carrier which can be coupled to an agricultural tractor. A plurality of frames are attached to the bottom of the carrier. The free ends of the frames are provided with rotation dampers to which an elongated blade is fitted. This blade runs parallel to the carrier and sprayers are present on top of the blade. The field crop spray apparatus further comprises a cylinder which is connected to the carrier, and also a piston that is movable inside the cylinder and is connected to the blade.