The present invention is simple in structure and can be adjusted independently of the left and right spraying amount of the granular spraying required for each position in the packaging, and in order to spray the granular spraying in a uniform distribution across the spreading width, storing the granular spraying A hopper having two discharge ports; Discharge control units positioned at each discharge port side of the hopper and independently and variably controlling the discharge of the granulated sprayed material sprayed to the left and the right with respect to the vertical line passing from each discharge port and passing through the center of the hopper; An air supply unit for supplying air for transporting the granular sprayed product discharged through the discharge control unit; A boom tube pair disposed at left and right sides with respect to a vertical line passing through the center of the hopper, and the granular sprayed material is transferred by air from the air supply unit, and openings are formed at equal intervals; And a plurality of granules each disposed at an opening of the boom tube so that the conveyed granule sprayed material can be evenly spread between the spreading widths, each of which has a plurality of heads having a collision plate and a reflecting plate which can enter and exit the boom tube. Provide a variable spreader.
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