Seed bulbs of Korean local garlic(cv. Seoshin) were planted in the field, and from sprouting to the harvest time the plant received daily 8 hours of sunlight followed by various night interruptions with incandescent lamp during 16hr dark period. Night interruption was applied for 30, 60 and 100 minutes with intermittent and continuous lighting, respectively. The response of growth and bulbing to those treatments were summarized as follows.
1. Plant height and length of leaf sheath tended to increase with longer duration and intermittent lighting of night interruption; intermittent lighting of 30 minutes (6 times with 5 min.) was more effective than continuous lighting, and was as effective as continuous lighting of 60 minutes at the middle of dark period.
2. Night interruption resulted in marked extension of flower stalls and slight suppression of secondary growth, and so intermittent lighting of 100 minutes was the most effective among the treatments.
3. Bulb weight was increased by longer and intermittent light treatment but intermittent lighting with shorter duration of night interruption was more effective.
4. From the value of neck/bulb diameter ratio, intermittent lighting of 30 minutes (6 times with 5 min. each), and 60 minutes or longer light treatment of both continuous and intermittent induced bulbing, while short day and 30 minutes treated with continuous lighting had no effects.
5. With above mentioned results, we suggest that night interruption for the bulbing of garlic be more effective in intermittent than those in continuous lighting with the same duration of total light treatment.
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