Effects of Light Quality, Daylength and Periodic Temperature Variation on the Growth of Lettuce and Radish Plants

Japanese Journal of Crop Science

Yoichi YASUMOTO¹  Katsumi INADA¹ 

关键词: Daylength;    栄養生長;    Lettuce;    温周性;    Light quality;    光質;    Radish;    赤色光/遠赤色光比;    R/B ratio;    赤色光/青色光比;    R/F ratio;    日長;    Thermoperiodicity;    ハツカダイコン;    Vegetative growth;    レタス;   

DOI  :  10.1626/jcs.58.689

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Effects of light qualities under continuous lighting, daylengths at a constant temperature, and periodic temperature variations under continuous lighting on the vegetative growth of lettuce and radish plants were studied to find the suitable environmental conditions for plant production in controlled environment rooms. Among the four light qualities, most growth parameters increased with increasing photon flux of the red component and the red/blue ratio in the light spectra, except when the red/farred ratio was extremely high. The plant growth was promoted with the increase of daylength up to 24 h, whereas the lighting effiency in terms of dry-matter production per lighting duration was greatest in 20 h daylength. Daily periodic temperature variations showed some effects on the plant growth and the greatest effect was found in temperature regimes of 16 H/8 L for lettuce and 20 H/4 L or 16 H/8 L for radish. The increased dry matter was distributed to both the top and roots in lettuce, but exclusively to the storage root in radish.

【 授权许可】

Unknown