Effects of self-incompatibility control substance and blossom thinner on fruit set and quality of apple (Malus domestica)

Authors : Tae Kwon SON, Jung Hee KIM, Cyren RICO, Sang Chul LEE, Il Kyung CHUNG

Pages : 207-212

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Publication Date : 2010-06-01

Article Type : Research Paper

Abstract :Effects of calcium nitrate insert ignore into journalissuearticles values(CN); and sodium sulfate insert ignore into journalissuearticles values(SS); blossom thinning agents applied after self-incompatibility control substance insert ignore into journalissuearticles values(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 insert ignore into journalissuearticles values(3 or 4 days after SICS treatment); or twice insert ignore into journalissuearticles values(3 and 5 or 4 and 6 days after SICS treatment);. Commercial Japanese flower thinning agent insert ignore into journalissuearticles values(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 : Key words Blossom thinning, fruit set, self incompatibility