In the present invention, the size of the discharge port is increased when the organic fertilizer is sprayed, and the discharge port of the fertilizer is uniformly adjusted when the inorganic fertilizer is sprayed, thereby controlling the amount of the fertilizer discharged to the discharge port according to the size of the organic fertilizer or the inorganic fertilizer To a multi-purpose fertilizer spreader for a tractor.To this end, the present invention provides a tractor comprising: a trailer capable of traveling on the basis of a traction force of a tractor； A hopper which is mounted to the trailer in a longitudinal direction and whose both sides become narrower as it goes downward, and a discharge port is formed in a rear lower portion to receive inorganic fertilizer or organic fertilizer； A main coaxial shaft mounted longitudinally at the center of the trailer and rotated by a pitch axis of the tractor； A moving means which is installed in the hopper and receives the rotational force of the main shaft to move the inorganic fertilizer or the organic fertilizer contained in the hopper to the discharge port； A shutter which is mounted on the discharge port and adjusts the discharge amount according to the inorganic fertilizer or the organic fertilizer contained in the hopper； And a spraying means mounted on a lower portion of the shutter and spraying the inorganic fertilizer or the organic fertilizer while being rotated by receiving a rotational force of the main shaft, wherein the moving means comprises an inorganic fertilizer or organic fertilizer A first screw for moving the fertilizer toward the discharge port； And a second screw mounted on the first screw to move the inorganic fertilizer or the organic fertilizer in a direction opposite to the discharge port.본 발명은 유기질 비료를 살포시에는 배출구의 크기를 크게 하고, 무기질 비료를 살포시에는 비료의 배출구를 일정하게 조절하여 유기질 비료 또는 무기질 비료의 입자의 크기에 따라 배출구로 배출되는 비료양을 조절할 수 있도록 한 트랙터용 견인식 다목적 비료살포기에 관한 것이다.이를 위해, 본 발명은 트랙터의 견인력을 전달받아 주행 가능한 트레일러와； 상기 트레일
