The effect of gibberellic acid and cyanamide reinforced with hot water treatment on the breaking of dormancy of Japanese cherry [Prunus] variety 'Keio-zakura' (Prunus x keio-zakura Ohwi cv. Keio-zakura) cut branches for early forcing
2005
Sato, T.(Yamagata-ken. Horticultural Experiment Station, Sagae(Japan)) | Takahashi, Y. | Nishimura, R. | Sato, H. | Ono, K.
Experiments were conducted to determine the reliable procedures to break dormancy of Japanese cherry variety 'Keio-zakura' cut branches for forcing to bloom stably and excellently from mid-late Dec. to early Jan.. Effects of applying gibberellic acid(GA3), leached solution containing 5% lime nitrogen (50%CaCN2) and pure cyanamide (10.0%H2CN2) solutions to the surface of dormant buds after soaking in hot water at 40 deg C for 1 hr with relation to the difference of quantitative measurements of chilling requirement as the number of hours below 8.0 deg C were examined. Branches were harvested on late Nov. andcut back 90cm in length, then put in water promptly until treatments. 1. It was not efficient for early forcing at the accumulation of 400 hr bellow 8.0 deg C. At the accumulation of 500-810 hr below 8.0 deg C, treatment with 25 or 50ppm GA3 and leached solution containing 5% lime nitrogen reinforced with hot water increased the % flowering more than 80% and these treatments were effective in hastening bloom. 2. After soaking in hot water, treatment with 0.2-0.5% H2CN2 were as effective as leached solution containing 5% lime nitrogen, and so it seemed H2CN2 could substitute for CaCN2. 3. In regard to floret quality, at the accumulation of 500-810 hr below 8.0 deg C , treatment with 25ppm GA3 reinforced with hot water was superior in having somewhat longer peduncle and larger flower diameter like a season flowering one to the other treatments. Thus, the treatment with these chemicals reinforced with hot water is useful to improve % flowering and floret qualities for early forcing of 'Keio-zakura'.
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