The present invention relates to a fertilizer applicator for a rice transplanter with a function of adjusting a discharge ratetl of fertilizer. The fertilizer applicator precisely and finely adjusts a discharge rate of fertilizer during fertilizing operations, and thus improves the performance of fertilization operations and enhances the overall efficiency of transplanting operations accordingly. The fertilizer applicator according to the present invention comprises a plurality of fertilizer application modules which are arranged in the horizontal direction at a rear position of a driving vehicle of the rice transplanter. The fertilizer application modules comprise: a fertilizer hopper for storing fertilizer； a fertilizer discharge unit arranged at a lower end of the fertilizer hopper, and discharging fertilizer； a fertilizer discharge pipe connected to the fertilizer discharge unit； and a discharge amount adjusting unit arranged at one side of the fertilizer discharge unit, and adjusting the discharge amount of fertilizer. The fertilizer discharge unit includes: a discharge case detachably coupled to a lower end of the fertilizer hopper； and a discharge roller installed to be rotatable inside the discharge case. The discharge amount adjusting unit includes: an adjusting knob installed to be rotatable at one side of the discharge case； an eccentric shaft arranged eccentrically with respect to a central axis line of the adjusting knob； a moving body moving by the eccentric rotation of the eccentric shaft； and a gap adjusting unit which is arranged at an end portion of the moving body, and adjusts a spacing gap from the outer circumferential surface of the discharge roller by the movement of the moving body.본 발명은 시비작업 시에 비료 방출량을 정밀하고 미세하게 조절함으로써 시비작업의 성능을 높일 뿐만 아니라 그에 따른 전체 이앙작업의 효율이 향상되는 비료 방출량 조절기능을 가진 이앙기용 시비장치에 관한 것이다. 본 발명에 의한 이앙기용 시비장치는 이앙기의 주행차량 후방에 좌우방향으로 배열된 복수의 시비모듈로 이루어지고, 상기 시비모듈은 비료가 저장되는 시비호퍼와, 시비호퍼의 하단에 마련되어 비료를 방출하는 시비방출유닛과, 시비방출유닛에 접속된 시비방출관과, 시비방출유
