Effect of light intensity, night temperature and flowering leads development on the flowering of Odontoglossum intergeneric hybrids

In order to develop an efficient method of flowering for Odontoglossum intergeneric hybrids on highlands, three experiments were conducted to determine the effects of light intensity, night temperature and flowering leads development on the flowering of these hybrids. These tests were examined at the Yatsugatake test field of the highland branch of the Yamanashi Agritechnology Center (at an altitude of 995 m). (1) The rate of the flowering stock was high at 15degC heating and higher light intensity plot, became 80% or more. There were a lot of the stocks that did not flower under the low light condition regardless of the temperature. There was no difference between the experimental plots in the flowering date, the number of flower stalks per plant or the number of flower buds per stalk. (2) When the flowering lead was secured in November of the previous year and April of the flowering year, the rate of the flowering stock was high. The rate of the flowering stock improved when the lead generated in October in June of the previous year was excised, and the lead generated next was assumed to be a flowering lead. There was a difference between the varieties on the flowering date, the number of flower stalks per plant, the number of flower buds per stalks, however the tendency in the experimental plots was not clear. (3) The rate of the flowering stock rose to 95-100% in the experimental plot where the night temperature and the control of the flowering lead had been combined with an appropriate light intensity, compared with the control plot. There were no differences in the flowering date, the number of flower stalks per plant or the number of flower buds per stalk. (4) In order for the Odontoglossum intergeneric hybrids flowering to be stable, it was important that the light condition was brighter than common practice of cultivation, the heating temperature in winter and autumn was 15degC and the flowering lead was secured during November of the previous year and April of the flowering year.