Effects of calcium nitrate (CN) and sodium sulfate (SS) blossom thinning agents applied after self-incompatibility 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.
Blossom thinning, fruit set, self-incompatibility
SON, TAE KWON; KIM, JUNG HEE; RICO, CYREN; LEE, SANG CHUL; and CHUNG, IL KYUNG
"Effects of self-incompatibility control substance and blossom thinner on fruit set and quality of apple (Malus domestica),"
Turkish Journal of Agriculture and Forestry: Vol. 34:
3, Article 4.
Available at: https://journals.tubitak.gov.tr/agriculture/vol34/iss3/4