Agriculture Reference
In-Depth Information
Storage of bulbs for 50 days at temperatures ranging from 1 to 25°C at 5°C
intervals showed that the most rapid bulbing after planting in 13 h photoperiods
at 20°C was shown by bulbs stored at 10°C (see Fig. 4.44a). When bulbs were
stored at 5°C for times ranging from 0 to 84 days, before planting in 13 h
photoperiods at 20°C, the longer the cool storage the stronger the subsequent
bulbing (see Fig. 4.44b). If bulbs that had been cold stored at 5°C for 50 days
were then exposed to warm temperatures (25, 30 or 35°C) before planting, the
bulb-promotive effect of cold storage was diminished and, after 42 days of warm
storage, virtually eliminated.
As with onion, the rate of bulbing of
A.
wakegi
is influenced by the red:far-
red (R:FR) ratio of the light. When bulbs of cv. 'Kiharabansei no.1' were planted
in summer under a translucent film that filtered out FR wavelengths from the
Fig. 4.44.
The effect of the temperature of mother bulb storage and the duration of
storage at cool temperatures on bulb development in
Allium
wakegi
subsequent
to planting out. The greater the bulk of bladeless 'scale' leaves the stronger the
bulbing. (a) Mother bulbs stored for 50 days at temperatures ranging from 1 to 25°C.
(b) Mother bulbs stored at 5°C for periods ranging from 0 to 84 days (from Yamazaki
et al
., 2003. Courtesy of
Journal of the Japanese Society for Horticultural Science
).
