Threshold intensity of twilight illumination for photoperiodism of rice based on solar altitude
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- WAKIYAMA Yasuyuki
- National Agriculture and Food Research Organization (NARO), Agricultural Research Center for Kyushu Okinawa Region
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- SAMESHIMA Ryoji
- NARO Agricultural Research Center for Tohoku Region
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- HAMASAKI Takahiro
- NARO Agricultural Research Center for Hokkaido Region
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- NEMOTO Manabu
- NARO Agricultural Research Center for Hokkaido Region
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- OZAWA Kiyoshi
- Japan International Research Center for Agricultural Sciences
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- OHNO Hiroyuki
- NARO Agricultural Research Center
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- MARUYAMA Atsushi
- National Agriculture and Food Research Organization (NARO), Agricultural Research Center for Kyushu Okinawa Region
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We conducted a study to determine the threshold intensity of twilight illumination for photoperiodism in rice (Oryza sativa L.) based on solar altitude in an open-field, day-length-extension experiment and utilization of a crop model. Light supplementation was provided by incandescent lamps and controlled based on solar altitude using four japonica rice cultivars: Hitomebore, Koshihikari, Nipponbare, and Nikomaru. First, pot experiments were conducted individually with supplementary light treatment in the morning and in the evening. By comparing the difference in heading time between rice with and without supplementary light, we determined the threshold intensity of twilight illumination. The threshold was between a solar altitude of 0° and -2° in the morning and evening civil twilight. Second, a field experiment was conducted with light supplementation in the morning and evening civil twilight. Based on the results, we concluded that the threshold intensity of illumination would be around a solar altitude between -1° and -2° in the morning and the evening civil twilight.
収録刊行物
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- 農業気象
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農業気象 69 (4), 265-276, 2013
日本農業気象学会
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詳細情報 詳細情報について
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- CRID
- 1390001204668273664
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- NII論文ID
- 130004446615
- 40019925344
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- NII書誌ID
- AA11530034
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- ISSN
- 18810136
- 00218588
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- NDL書誌ID
- 025111381
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可