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Flowering Responses of Rice and Soybean to Nyctoperiod and Night Break  

김충국 (농촌진흥청 작물시험장)
서종호 (농촌진흥청 작물시험장)
최성호 (농촌진흥청 작물시험장)
최경진 (농촌진흥청 작물시험장)
이진모 (농촌진흥청 작물시험장)
변종영 (충남대학교)
Publication Information
Korean Journal of Agricultural and Forest Meteorology / v.5, no.3, 2003 , pp. 208-212 More about this Journal
Abstract
Extended light illumination by street lamp and automobile light has provoked problem in farmland. Night break was imposed by incandescent lamp (50∼60 lux) for 10 minutes every three hours during 12 hours dark period increased culm length compared to continuous dark of 12 hours, and decreased the number of grains per spike in rice. However, these characters were increased by 12 hours dark period with and without night break as compared to 9 hours continuous dark condition. Compared to 12 hours continuous dark condition, night break delayed heading by 9 and 26 days and 9 hours continuous dark condition delayed it by 47 and 41 days in Ilpumbyeo and Hwaseongbyeo, respectively. Night break increased stem length and node number, while decreased pods of soybean cultivar Hwanggeumkong. The stem length and node number were increased by 9 hours continuous dark condition compared to 12 hours dark condition with and without night break. Compared to 12 hours continuous dark rendition, night break delayed flowering by 4 days and to 9 hours continuous dark condition by 19 days.
Keywords
photoperiod; nyctoperiod; night break; irradiation; flowering; rice; soybean;
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