하우스밀감의 수부증 발생을 억제시키고 밀감의 품질을 향상시키기 위하여 Clef-non, Kalk-H, Calhard, Suical을 엽면살포한 결과 잎과 과피 내 칼슘함량에는 차이가 없었다. Suical, Calhard, Kalk-H, Clef-non 순으로 이들 칼슘의 살포회수가 많아질수록 수부증 발생이 낮아졌으며, 과피의 착색은 이와 반대의 경향으로 착색이 촉진되어 a 값이 높아지는 경향이었다. 과피두께도 이와 유사한 경향으로 Suical, Calhard, Kalk-H, Clef-non 순으로 이들 칼슘제의 살포회수가 많아질수록 두꺼워짐으로 인해서 과육률은 낮아지는 결과를 나타내었다. 유리당 함량은 Suical, Calhard, Kalk-H, Clef-non 순으로 이들 칼슘제의 살포 회수가 많아질수록 높아져서 과육율과는 반대의 경향을 나타내었다. 당도는 칼슘제 무살포에 비해 3회 살포구에서 Clef-non은 1.7?Bx, Kalk-H는 1.34?Bx, Calhard는 1.37?Bx, Suical은 1.84?Bx 높아져서 Suical, Clef-non, Calhard, Kalk-H 순으로 증가되었다.The study was carried out to elucidate the effects of calcium formulae foliar application on the water spot outbreak and the quality of fruit of early-maturing satsuma mandarin (cv. Miyagawawase) inside plastic house. Results showed that there were no differences in Ca contents of leaves and rind depending upon calcium salts and spaying frequencies. However, outbreak rate of water spot decreased first in Suical, followed by Calhard, Kalk-H, and Clef-non as foliar application of Ca salts. a value of rind increased first in Suical, followed by Calhard, Kalk-H, and Clef-non as foliar application of Ca salts, showing peel coloration has a contrary effect on outbreak of water spot. Peel thickness were heavy in Suical. Peel thickness of Calhard, Kalk-H, and Clef-non on the other hand are not as thick as Suical, since foliar application of Ca salts, resulted in pulp low ratio. Reducing sugar, sucrose, and total sugar had a opposite effect on pulp ratio. Free sugar are higher in Suical, followed by Calhard, Kalk-H, and Clef-non as Ca salts was applied. The soluble solid level treated three times through Ca foliar application had higher values at 1.7 ?Bx, 1.34 ?Bx, 1.37 ?Bx, and 1.84 ?Bx than control, respectively. The highest value can be found in Suical, followed by Calhard, Kalk-H, and Clef-non.