Volume 60 Number 4 Article 26
Year 2006 Month 10
Title: Effects of Hydrogen Cyanimide, Ammonium Thiosulfate, Endothalic Acid, and Sulfcarbamide on Blossom Thinning, Fruit Quality, and Yield of Apples
Authors: E. Fallahi, C.R. Rom and B. Fallahi
Abstract:
Effects of rates and/or timings of hydrogen cyanamide (Dormex™), ammonium thiosulfate (ATS), endothalic
acid (Endothal), and/or sulfcarbamide (Wilthin®) on blossom thinning (fruit set), fruit quality, and yield of ‘Delicious’,
‘Law Rome Beauty ’, ‘Fuji’ and ‘Jonathan’ apples (Malus × domestica Borkh.) were studied.
In ‘Delicious’,
application of Dormex™ at 1.56 or 2.34 mL.L-1 (v/v) or ATS at 16 or 24 mL.L-1 (v/v) reduced fruit set
and increased fruit size.
In ‘Delicious’, reduction of fruit set with application of Dormex™ at 1.56 mL.L-1 (v/v)
resulted in a significant increase in yield.
In ‘Law Rome Beauty’, application of Dormex™ at 3.12 mL.L-1 (v/v)
or ATS at 16 or 24 mL.L-1 (v/v) reduced fruit set in two years.
Also, application of Endothal once at 1.88 mL.L-1
or twice at 1.25 mL.L-1 (v/v) reduced fruit set in ‘Law Rome Beauty’. One application of ATS at 25 or 30 mL.L-1
(v/v) or two applications of ATS at 15 or 25 mL.L-1 (v/v) reduced fruit set of ‘Fuji’. In ‘Jonathan’, one or two
applications of ATS at 25 mL.L-1 (v/v) reduced fruit set.
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