2018 Volume 17 Issue 1 Pages 61-72
In the present study, the effects of hydrogen cyanamide (H2CN2) on blooming, vegetative bud sprouting, the ornamental period, and characteristic blossom form of ‘Izutoi’ and Line “Toizakura Shirobana” cherry blossom (Prunus spp.) trees were investigated. In experiment 1, dormant branches were sprayed with 1.0% H2CN2 on October 22 and November 11, 2010. After the H2CN2 spraying carried out on November 11, blooming occurred 35 days earlier in both the strains than in the controls. There was no difference in the effect of spraying H2CN2 in the ornamental period between the two cultivars. In experiment 2, whole trees were sprayed overhead with 1.0% H2CN2 on November 8, 2011. In ‘Izutoi’ blooming occurred 44 days earlier than that in the controls. In “Toizakura Shirobana” blooming occurred 38 days earlier than that in the controls. Spraying both whole trees and only branches with 1.0% H2CN2 yielded similar results. No significant difference was observed in the diameter of the blossoms. In contrast, a significant difference was observed in blossom color. In conclusion, spraying ‘Izutoi’ and Line “Toizakura Shirobana” cherry blossom trees with 1.0% H2CN2 in mid-November promoted blooming to the greatest extent.
