Studies on bulb formation in onion plants. VI. Conditions affecting the influence of short days on bulb development in plants previously exposed to long days
Journal of the Japanese Society for Horticultural Science 40(1): 10-16
Kaizuka-wase plants exposed to 4 or 6 long days (8 h sunlight+16 h artificial light at 1000 lux) began to produce bulbs noticeably after 7-10 short days' (8 h) treatment. Plants exposed to only 2 long days, and plants exposed to 6 long days and then to very short 2- or 4-h days, did not produce bulbs.