Author/Authors :
SON, Tae Kwon Catholic University of Daegu - R D Center, ISTECH Inc , 408 CU Techno Center, KOREA , KIM, Jung Hee Catholic University of Daegu - Department of Biotechnology, KOREA , RICO, Cyren Catholic University of Daegu - R D Center, ISTECH, Inc 408 CU Techno Center, KOREA , LEE, Sang Chul Kyungpook National University - College of Agriculture and Life Sciences, School of Applied Plant Biosciences, KOREA , CHUNG, Il Kyung Catholic University of Daegu - Department of Biotechnology, KOREA
Abstract :
Effects of calcium nitrate (CN) and sodium sulfate (SS) blossom thinning agents applied after selfincompatibility control substance (SICS) treatment on the fruit set rate and quality of apple were investigated for 2 cropping seasons. CN and SS at 0.1% and 0.2% concentrations were applied once (3 or 4 days after SICS treatment) or twice (3 and 5 or 4 and 6 days after SICS treatment). Commercial Japanese flower thinning agent (FTA: Ekoruki) treated and untreated apple trees were used as treated and untreated controls. SICS was sprayed 7 days before full bloom. Both agents showed a fertilizing effect in ‘Hongno’, improving its fruit yield and quality. SS obtained 29.8% and 36.3% thinning rates in the central floret of ‘Fuji’. Both CN and SS were effective in ‘Gala’, which induced a lower fruit set than SICS treated plants. Earlier and double applications of CN and SS at 0.2% concentration resulted in a higher thinning rate and improved fruit quality in ‘Gala’. Results also showed similar thinning efficacies in Ekoruki, CN, and SS.
Keywords :
Blossom thinning , fruit set , self , incompatibility
