Effects of long-day treatment and temperature control after flower budding on the cut flower quality and flowering of Eustoma grandiflorum (Raf.) shinn in spring shipment
2019
Kondou, K. (Fukuoka Agriculture and Forest Research Center, Chikushino, Fukuoka (Japan)) | Kunitake, T. | Suyama, T. | Nakamura, C. | Tanigawa, T.
In the winter and spring shipment of cut Eustoma grandiflorum flower production, blasting of flower buds often occurs, resulting in a delay of the harvest time and cut flower quality degradation. We investigated the effect of long-day treatment and temperature control after flower budding on the cut flower quality and flowering of Eustoma grandiflorum in spring shipment. Night break treatment using low R/FR-ratio light (for example incandescent lamp) after flower budding decreased frequencies of blasting and increased the number of flower buds compared with those under a natural day length. Night temperature of 5℃ delay flowering for two weeks compared with those 10℃, however increased the number of flower buds and decreased the number of flower buds blasting. Ventilation settings 25℃ increased the number of flower buds and decreased the number of flower buds blasting compared with those 35℃. And when the flower bud developed, shut greenhouse side tightly in order to raise the temperature, the flower bud blasting was caused high frequency.
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